Being the one who stays to help clean up after the event nobody wanted to plan takes a quiet kind of guts.

Cleanup is the part where the audience has gone and there is nothing to be seen doing. That is exactly why staying counts. Nobody is handing out credit, so the only reason to be there is that the work still needs doing. People notice anyway, quietly and permanently, and it tends to decide who gets asked to do real things later on.

Stay for the last twenty minutes of the next thing you go to. Stack the chairs, carry a bag out, and do not mention it afterward.