Glossary
What is a site public ID?
A site public ID is the short public identifier for a venue, such as krsyhg5efr. It appears in venue page addresses, signup links and printed QR codes. It is deliberately not the internal database identifier, so what gets printed on a poster can be public safely.
Public identifiers exist so internal ones never have to leave the building.
Where you meet it
In the address of a venue page, in a signup link, and encoded in the printed signup QR. It is stable, so a poster printed today keeps working.
Why not just use the name
Names change, and they collide. An identifier that is short, opaque and stable survives a rebrand without invalidating anything already printed.