Event.category is a free-text field on-chain; the backend enforces
a closed set of twelve values so the marketplace and dashboard can
filter and label consistently:
Concerts, Flights, Sports, Festivals, Conferences, Bus companies, Movie theaters, Museums, Tourist attractions, Public transport, Universities, Corporate events.
Adding a thirteenth industry requires no contract change — only a
backend enum update (Industry in
StellarTickets/backend's
Prisma schema) and a frontend label.