Event evaluation report: Participation analysis model of portable planetarium dome

1. Introduction

In late spring of this year, the Community Science Outreach Initiative (CSOI) hosted a three-day educational event titled "Starry Skies on the Go," centered around a portable planetarium dome . Designed to bring immersive astronomy experiences to underserved communities, the event aimed to make complex cosmic concepts accessible to audiences of all ages—from curious 5-year-olds pointing at "the big dipper" to high school students exploring black hole physics. Unlike traditional fixed-dome planetariums, this inflatable structure promised flexibility: it could be set up in school gyms, park pavilions, or community centers, eliminating barriers like travel distance or cost. Over 1,200 participants attended across six school sessions and eight family-friendly evening sessions, making it one of CSOI's most ambitious outreach efforts to date. This report analyzes the participation model behind the event, examining what drove attendance, how audiences engaged with the content, and where improvements can be made to replicate success in future initiatives.

2. Methodology: How We Collected and Analyzed Data

To understand participation patterns, we combined quantitative and qualitative data collection methods. For hard numbers, we tracked attendance via sign-in sheets (recording age, group affiliation, and session time) and used digital counters at the dome entrance. For deeper insights, we distributed post-session feedback forms (both digital and paper) to 30% of participants, asking about their motivation for attending, favorite activities, and suggestions for improvement. We also conducted short, on-the-spot interviews with 20 random attendees and held a debrief with the event's volunteer team, who noted observations like "families with younger kids stayed longer for the interactive star charts" or "high school groups were more engaged during the black hole simulation."

The inflatable planetarium education projection dome itself became a data point: its 6-meter diameter allowed for 30 seated participants per session, but we experimented with "standing room only" slots for larger school groups to test capacity limits. This helped us gauge how space constraints affected engagement—a key variable in the participation model.

3. Participation Data Analysis: Who Came, When, and How They Engaged

Over three days, the event hosted 1,247 participants across 14 sessions. Below is a breakdown of key metrics, including attendance by age, session type, and engagement levels:

3.1 Attendance Trends: Time Slots and Audience Segmentation

School sessions (9 AM – 2 PM) saw the highest overall attendance (755 participants), driven by local elementary and middle schools. The 9-12 age group dominated here, with 320 students—many from Title I schools that had partnered with CSOI for free transportation. Family sessions (5 PM – 8 PM) drew 492 participants, with a nearly even split between children (5-12) and adults. Notably, weekend family sessions (Saturday and Sunday) had 30% higher attendance than Friday evening, likely due to work/school schedules.

Peak engagement occurred during mid-morning school sessions (10-11 AM) and Saturday evening family sessions (6-7 PM). These slots correlated with higher energy levels (observed via more questions from participants) and better weather—an important factor, as the dome was set up in an outdoor park pavilion (with a rain plan to move indoors, which wasn't needed).

3.2 Key Engagement Drivers: The Dome's "Wow Factor" and Content Relevance

The inflatable planetarium education projection dome itself was a major draw. In surveys, 82% of participants cited "the immersive dome experience" as their top reason for attending, with comments like, "I've never seen stars that clearly without driving to a rural area" (adult participant, 34) and "It felt like we were floating in space!" (8-year-old, school session). The dome's portability meant we could bring this experience directly to communities where access to traditional planetariums is limited—25% of family session attendees lived more than 20 miles from the nearest science museum.

Content also played a role. School sessions tailored to 5-12-year-olds focused on storytelling (e.g., constellation myths) and simple experiments (using a flashlight to star brightness), while family sessions added deeper dives into current space missions (e.g., the James Webb Telescope). This customization boosted engagement scores for younger groups, though 13-17-year-olds rated content as slightly less relevant—suggesting a need for more advanced material for teens.

4. Key Findings: What Worked and What Didn't

4.1 Successes: Portability, Accessibility, and Interactive Add-Ons

The portable dome's inflatable design was a game-changer. Setup took just 45 minutes (with a small team and electric air pump), allowing us to host sessions in multiple locations over three days—including a pop-up at a local farmers market on Sunday morning, which drew 70 impromptu attendees. This flexibility expanded our reach beyond pre-registered groups, tapping into casual community foot traffic.

Accessibility efforts also paid off. We offered free admission, translated materials in Spanish and Arabic (reflecting the local community), and reserved 10% of seats for families with disabilities (providing sensory-friendly sessions with dimmer lights and reduced sound). Post-session feedback highlighted these efforts as "inclusive" and "thoughtful," with 91% of participants rating the event as "easy to attend."

Supplementary tools, like an inflatable projection screen set up outside the dome, enhanced engagement. Before entering the dome, participants watched short clips (e.g., a 2-minute animation of the solar system) on the screen, priming them with context. This "pre-dome" activity reduced confusion during sessions and increased question-asking by 30% (observed via volunteer notes).

4.2 Challenges: Technical Hiccups, Capacity Limits, and Teen Engagement

Despite successes, three main challenges emerged. First, technical issues: the projection system occasionally glitched in direct sunlight, causing blurry images. This affected two Saturday afternoon sessions, leading to lower engagement scores (3.2 vs. the average 4.0). Second, capacity: the dome's 30-person limit meant some school groups had to split into multiple sessions, leading to scheduling delays. One high school teacher noted, "We lost momentum waiting for the second group to go in."

Third, teen engagement lagged. While 13-17-year-olds attended (145 in school sessions), their feedback indicated boredom with "too much kid stuff." A 15-year-old wrote, "I wanted to learn about black holes, not why Orion has a belt." This suggests a need to differentiate content more sharply for older students.

5. Recommendations: Refining the Participation Model

Based on data and feedback, here are actionable steps to improve future portable planetarium events:

5.1 Technical and Logistical Fixes

• Upgrade projection equipment: Invest in a high-brightness projector (5,000+ lumens) to combat sunlight issues. Test it in various lighting conditions during setup.
• Staggered scheduling: For school groups, limit each session to 25 participants (instead of 30) to reduce overcrowding. Add 15-minute buffers between sessions to avoid delays.
• Weather contingency plan: Partner with a nearby community center to reserve indoor space, ensuring sessions can move indoors during rain or extreme heat.

5.2 Content and Engagement Strategies

• Teen-focused sessions: Create a "Cosmic Deep Dive" track for 13-17-year-olds, covering topics like relativity, exoplanets, and career paths in astronomy. Invite a local astrophysicist to lead Q&As.
• Interactive post-dome activities: Expand beyond the inflatable projection screen by adding hands-on stations (e.g., building paper rockets, using star charts to find constellations). This could boost post-session participation among teens (currently 42%).
• Recurring partnerships: Partner with schools for monthly mini-sessions (e.g., "Space Storytime" for elementary, "Astronomy Club" for high schools). This builds long-term engagement and reduces reliance on one-time events.

5.3 Outreach and Accessibility

• Targeted teen outreach: Collaborate with high school science teachers to promote sessions as extra credit opportunities. Use social media (TikTok, Instagram Reels) to share clips of dome experiences, highlighting teen-relevant content.
• Expand language support: Add materials in Somali and Vietnamese, based on local demographic data. Train volunteers in basic sign language to better assist deaf/hard-of-hearing participants.

6. Conclusion: Scaling the Model for Impact

The "Starry Skies on the Go" event demonstrated that a portable planetarium dome can be a powerful tool for community science outreach. Its success stemmed from a participation model built on accessibility, portability, and interactive content—factors that drove high attendance and positive feedback. While challenges like technical issues and teen engagement need addressing, the core model is strong.

Looking ahead, scaling this model could involve partnering with regional education networks to deploy multiple domes across a state or province. Imagine a fleet of portable domes visiting rural schools, community centers, and even disaster relief zones—bringing the wonder of space to those who need it most. With the right refinements (better tech, teen-focused content, strategic partnerships), the participation model outlined here could become a blueprint for educational outreach nationwide.

In the end, the event wasn't just about stars—it was about connecting people to science in a way that feels personal, accessible, and fun. As one 9-year-old participant put it, "I didn't know space could be this cool. Can we do this every month?" That's the impact we aim to replicate.