Spring Chirp is a four-day birding festival in the Rio Grande Valley — one of the few places in the United States where birders can see species that don't occur anywhere else in the country. It's organized by the Valley Nature Center, a conservation nonprofit in Weslaco.
It's also the festival FestivalSentry was built on. Not a pilot or a demo: registration is open, money has moved, and the vendor expo is being laid out on the real floor plan right now.
Where it started
Registration ran through the festival's old content management system — the built-in forms that came with the website. That works for a single-price event with one list of attendees. It does not describe a festival where one person buys a three-day pass, picks a different field trip each morning, adds a surcharge trip on Friday, orders a shirt in a specific size, and declares a dietary restriction the caterer needs three weeks ahead.
Everything the CMS couldn't model ended up being modeled by a person: spreadsheets for trip signups, email threads for capacity, and a lot of careful cross-referencing before every festival.
What got built
Registration that matches how the festival is actually sold
Duration-based pricing — one, two, or three days — with per-trip surcharges layered on top. A registrant picks their days, then picks a trip for each day, adds a shirt, declares a meal preference, and gives an emergency contact. One checkout, one confirmation, one record.
Thirteen field trips with real constraints
Each trip has its own capacity, its own days, its own assigned guides, and its own meeting point. Capacity enforces itself, so a trip closes when it fills instead of being over-sold and untangled by hand later.
An attendee app that works without a signal
The Rio Grande Valley's best birding is in refuges and coastal flats with no cell coverage — exactly where an attendee app would normally stop working. Spring Chirp's is installable, and its bird checklist keeps working offline. Trip leaders build the official list for their trip, attendees keep their own, and sightings sync when the phone is back in range.
The species database behind it is the full eBird taxonomy, with the several hundred species actually likely in the Valley flagged so search returns useful results first.
Daily species counts, public
Because sightings are already being logged in the field, the daily totals assemble themselves. There's a public recap page for each day — no login — that the festival can share while the event is running. Attendees compare lists, people who missed a trip see what it turned up, and the festival gets a reason to post something every single day.
A vendor expo with a floor map
The organizers uploaded their actual expo floor plan and drew booth positions onto it. Vendors see the same map: green booths are open, gray ones show who's already there and what they sell. Pick a booth, fill in your business details, done — and the booth is held the moment you submit, so two vendors can't claim the same space.
There's a public vendor directory too, so attendees can see who's exhibiting before they arrive.
The reports nobody thinks about until the week before
Meal counts by dietary restriction. Shirt sizes to order. Printable van rosters for each trip leader with emergency contacts. Collection sheets for fees due on site. These aren't features anyone asks for in a demo, and they're the ones that get used at 5:45 in the morning.
Where it stands
- Live at springchirp.com since August 2026, taking real registrations through the festival's own Stripe account
- 13 field trips across four days, with guides, meeting points, and capacity
- Offline bird checklists deployed and working
- Vendor booths mapped on the real expo floor plan, open for applications
- Every dollar goes directly to the Valley Nature Center — the festival keeps its own payment processor and attendees never see a platform fee
What transferred to the product
Most of what FestivalSentry does exists because Spring Chirp needed it, not because it looked good on a feature list. The composite booking model, the offline checklist, the vendor floor map, the van rosters — each one came from a real problem with a date attached.
That's the argument for building against a live festival rather than a spec: you find out which features matter when someone is standing in a parking lot at dawn waiting for an answer.