In lifestyle settings, on-premise generally describes a venue that permits sexual activity on site. Off-premise generally describes a social gathering where that activity happens elsewhere. Ask the organizer how it uses the terms. Find out which rooms guests can enter, what activities are allowed and whether the event changes the venue’s usual arrangements.
You can enter a space, talk to someone and still decline a later invitation. Ask for consent to the interaction you are proposing and respect a change of mind. If you attend with a partner, discuss your boundaries before arriving and keep checking with each other when the evening changes.
An invitation after an off-premise event creates a new decision. Ask where you would go and who is hosting. Keep transport and contact arrangements you control, including a way to leave. The event organizer may have no role in a gathering outside its venue. You can enjoy the earlier conversation and decline the later plan.
Swing.com explanation of on-premise and off-premise venues. The directory describes the distinction by whether a venue offers areas for sexual activity on site.
