A new community becomes easier to enter when someone explains how ordinary things work.

What keeps a newcomer outside is rarely the big things. It is where to sit, whether people bring food, what the unspoken start time is, and who to ask about the thing nobody explains. Insiders stop seeing these rules, so they never get said, and the newcomer reads their own confusion as evidence of not belonging.

If you are inside, tell someone new the boring practical details without waiting to be asked. If you are new, ask one plain logistical question rather than working it out alone. That is the fastest route from visitor to participant.