There's a QR code on a poster on the door of #PanConMadre. Seems to be advertising a multi-lingual get together; QR code has this url: https://qr.me-qr.com/gb0ucGae

Now, that seems to be some kind of MITM advertising serving service, (successfully blocked by browser), but I can click a "Skip ad" button and get redirected to this URL: https://www.instagram.com/luditalk/ in which there is a thumbnail that appears to mention a language exchange event in #Oaxaca. Clicking that leads me to this screenshot. 😕