A friend of yours is performing. You know this because you check the website of the group to which this person belongs. Ordinarily you get an invite, or an e-mail saying “Hey, I’m doing this here then.” But you’ve received no e-mail for this show.
Do you go to the show, even though knowing about it is a minor form of stalking? Or do you say: “If my presence was requested, I would have gotten a request,” and make other plans?
Corollary question: how much of a friend is this friend? And what are you saying by going: "I support you," or "Here I am--look at me?"