Connect CrowdPass to Redis
Power sub-millisecond event experiences with in-memory caching, real-time counters, and live leaderboards
Some event data needs to move faster than a traditional database allows. Real-time check-in counters that update on screens throughout the venue, live leaderboards for gamified networking, session popularity rankings that shift as attendees vote with their feet, and access control decisions that must resolve in milliseconds at turnstile gates. Redis handles these use cases because it stores data in memory, delivering sub-millisecond read and write latency. Connecting CrowdPass to Redis via Zapier means event triggers write to Redis data structures — incrementing counters, publishing to channels, appending to streams — that power the real-time experiences attendees see and feel. Redis isn't your primary database; it's the real-time acceleration layer that makes your event technology feel instant.
Automations you can build
Check-ins increment a Redis counter key ("event:12345:checkins") that the venue's live display reads via a WebSocket connection. Simultaneously, a Redis PUBLISH command broadcasts the check-in to all subscribed clients — the ops dashboard, the welcome screen, and the speaker's green room monitor all update within milliseconds. The counter is atomic, so concurrent check-ins never produce incorrect counts.
Each booth scan increments the exhibitor's score in a Redis sorted set ("event:12345:booth_leaderboard"). The expo hall's main display shows a live leaderboard of the most-visited booths, updated in real time. Exhibitors compete for traffic visibility, and attendees discover popular booths they might have missed. The sorted set maintains ranking automatically — no re-sorting needed on each update.
Registrations append to a Redis stream ("event:12345:registrations") that consumer groups process for different purposes. One consumer updates the registration counter on the event website. Another consumer checks if the registrant is a VIP and triggers a welcome workflow. A third consumer aggregates registration velocity (registrations per hour) for the marketing team's real-time campaign monitoring. Redis streams guarantee no event is lost even if a consumer temporarily disconnects.
How event teams use this
Live gamification leaderboard for networking events
A tech conference gamifies networking by awarding points for interactions: checking into sessions (10 points), scanning badges at booths (15 points), completing a scavenger hunt challenge (25 points). Each interaction from CrowdPass writes to a Redis sorted set. The conference app reads the sorted set to display a live leaderboard. Attendees refresh the leaderboard on their phones to see their ranking update in real time. The top 20 attendees at the end of each day win prizes announced on stage. Redis handles 500 concurrent score updates during peak hours without breaking a sweat — the leaderboard re-ranks in under a millisecond.
Sub-millisecond access control at venue gates
A stadium event with 30,000 attendees uses CrowdPass NFC wristbands at 40 turnstile gates. Each gate tap queries Redis to check if the wristband ID is valid and has not already entered (deduplication). Redis responds in under a millisecond — fast enough that attendees walk through without breaking stride. The gate system cannot afford the 50-100ms latency of a traditional database query; at peak entry flow, each gate processes one attendee per second, and any delay creates a cascading queue. Redis's in-memory lookups keep the gates moving. A background process syncs the Redis access list with the primary database every minute, ensuring revoked wristbands are removed promptly.
Real-time session popularity heatmap
A multi-track conference displays a live heatmap on lobby screens showing which sessions are "hot" right now. CrowdPass session check-ins increment Redis counters for each active session. A lightweight web app reads these counters every two seconds and renders a heatmap: sessions with rapid check-in growth glow red, steady sessions show yellow, and winding-down sessions fade to blue. Attendees between sessions glance at the heatmap to decide where to go next, naturally distributing attendance across tracks and reducing overcrowding in popular sessions.
Connect in 3 steps
No code required. Set up in under 5 minutes.
Log in to Zapier
Go to zapier.com and search for "CrowdPass" in the app directory. Connect your CrowdPass account using your API key from Settings > Integrations.
Choose your trigger
Select a CrowdPass trigger event: new registration, attendee check-in, NFC badge scan, lead capture, or form submission. Each trigger sends full attendee data.
Map your action
Choose the destination app and configure what happens. Map CrowdPass fields (name, email, ticket type, custom questions) to the app's fields. Test and activate.
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Ready to connect CrowdPass to Redis?
Schedule a demo and we'll help you set up the perfect automation for your next event.