Callstack “Ideas No One Else Suggested”: A 30-Day Sprint for React Universe Conf
Event Marketing Case Study
Marketing Planning Engagement CRO
The Challenge
Callstack had rebranded their flagship “React Native EU” to React Universe Conf, and 75 days out they still needed to drive serious ticket sales against a ~$1,000 price point that mostly cleared through B2B buyers, not individuals. With just one month to go, they’d already worked their internal list and ridden the early bird wave (where most of their registrations came from), and came to us looking for fresh creative angles to reach new audiences without breaking the new brand they were still introducing to the community.
Our Solution
We ran a 30-day blitz across three lanes at once:
- Targeted cold outreach to React and React Native engineering leaders across Poland and neighboring European countries, anchored by a 20% group discount built for teams of four or more developers.
- Paid social and multichannel retargeting aimed at devs already in the React ecosystem, leaning on the speaker lineup (Meta, Shopify, Expo) as the hook and iterating creative in near-real-time with Callstack’s team.
- CRO on the registration flow, including “convince your boss” assets that helped individual devs justify the ~$1,000 spend to their decision-makers internally.
The Results
Roughly 500 attendees showed up in Wrocław, hitting the venue’s targeted capacity, with thousands more watching the global livestream of 20+ talks from Meta, Shopify, and Expo. The rebrand from React Native EU to React Universe Conf landed cleanly, unifying both the React and React Native communities under one roof for the first time, and the event generated enough social momentum that attendees were posting about “flawless organization” while it was still running.
Featured Service
Advanced Retargeting
Most event ad campaigns run a few messages and call it a day. We layered the funnel: featured-speaker creative for the awareness layer, workshop and content-specific creative for warm prospects who’d already engaged, group discount messaging for team-buyers, and last-chance urgency creative for the final push, all written in language that actually resonates with React and React Native developers (not generic conference-speak).
In Their Words
“We were very impressed by how you really listened, and came with ideas no one else suggested. The ad drafts were great, delivered within just 48 hours. Thanks for the cooperation. We learned from you.”
Mateusz Kornacki
Event Marketing Manager, Callstack
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