Do you know nostr:npub13qv9uflfdn70c0zcccju7uxymwn407xjax4he2uq75qj5dp7klfqt74rrf ?

They have a guide:

🔗 https://lightsats.com/es/guide

you can also use Lightsats to give #bitcoin tips to the attendees and if they didn’t claim it you can have the sats back