assemblies

companies, consorts, coteries, gangs, packs

caucuses, forums (also fora), markets, panels, rallies, symposia (or symposiums), synods

audiences, galleries, grandstands, houses

crowds, flocks, hordes, legions, multitudes, presses, swarms, throngs

crushes, mobs, rabblements, rabbles

flocks, laities, parishes

communions, confessions, denominations, folds, sects

clinics, workshops

cabinets, caucuses, conclaves, synods

demonstrations, rallies

confabs, conversations, dialogues (also dialogs), discourses, discussions, palavers, talks

negotiations, parleys, summits

conferences, forums (also fora), round-robins, roundtables (or less commonly round tables), seminars, symposia (or symposiums)

audiences, interviews, sessions