feat: activate Sep 2026 speakers event

[rnegron]

Preps the site for Fullstack Nights: Speakers — Thursday, September 10, 2026, 6:00–9:00 PM, Bayamón PR.

Event

• Three talks: Giovanni Collazo (jj es más fácil que git), Christian Rodríguez (Tus agents necesitan acceso (seguro) a producción), Raúl Negrón-Otero (Un vistazo a Django Template Partials)
• PostHog as sponsor — logo is the unmodified standard landscape mark from posthog.com/brand, which is the variant their handbook specifies for light backgrounds
• Venue shows "Bayamón, Puerto Rico" linked to Luma, since Luma keeps the street address guests-only

Schedule

/schedule/ now generates its timeline from CONFIG.event.participants instead of the hardcoded two-speaker list, so it scales to any lineup:

Sep 10   Bayamón, Puerto Rico — make your way to our venue
6:00pm   Doors open / Check-in
6:20pm   Introduction and kick-off
6:30pm   Presentation 1
6:50pm   Presentation 2
7:10pm   Presentation 3
7:30pm   Wrap-up / Networking
9:00pm   The end

20 min per slot (15 talk + 5 Q&A), 1h30 of networking. Slots are numbered rather than named so the schedule doesn't commit to a speaking order — only the participant count reaches the timeline. Names and topics still appear in the homepage line-up, which is a roster rather than a running order. Slot timings live in CONFIG.event.agenda, so a future event with different talk lengths still only touches src/config.js.

Supporting changes

• Registration links point at Luma. The previous fullstacknights.eventbrite.com URL was dead. RegistrationButton replaces two byte-identical anchors backed by two duplicate i18n keys.
• src/date.js — dates now localize. Spanish gets day-before-month ordering (jueves, 10 de septiembre de 2026); both languages keep 12-hour am/pm, which is what Puerto Rico uses. Date strings are offset-less ISO so every visitor sees venue wall-clock time rather than their own timezone.
• src/language.js — there were three different "is this Spanish?" checks that disagreed: date.js and luma-events.js used startsWith("es"), while i18n.js used === "en-US". A tag like en-GB was classified inconsistently. Now one rule.
• Off-season /schedule/ shows the Luma calendar instead of an empty timeline plus a ticket link to a past event. The nav hides the route, but bookmarks and old links don't go through the nav.
• Copy — dropped the open-mic line (no open mic this format) and reworded the sponsors blurb. Unused keys removed from both locales; en.json/es.json verified structurally in sync.
• sponsors.js got intrinsic width/height to avoid layout shift now that the section renders for the first time.

Verification

npm run lint clean. npm run build exits 0, and I verified the rendered HTML for / and /schedule/. Also built with activeEvent: false to confirm the off-season path works — no ticket CTA, no empty timeline.

Built locally on Node 26.5.0 rather than the 22.22.2 in .nvmrc; CI is the real check on that.

🤖 Generated with Claude Code

[github-actions]

¡Gracias por tu interés en Fullstack Nights y por hacer este Pull Request! Pronto estaremos en contacto. / Thanks for your interest in Fullstack Nights and for opening this pull request! We'll be in touch soon.