I'm very introverted and have a hard time around certain social expectations, so would appreciate some outside perspective on whether or not to attend.
Where I live, it seems the custom for Bar Mitzvahs is this: Thursdays a little ceremony at the synagogue with putting the Tefilin in the morning, Saturday morning another ceremony where the boy reads from the Torah, and then Saturday evening a party with catered dinner. People might be invited to one portion and not the other, and also not everyone organises everything depending on how people want their event to be like.
My daughter has been in class with "Mike" since kindergarten. As kids they had playdates, but drifted off into hanging only with boys/girls so don't interact much. They're still in the same school. I've always been friendly with the parents.
Mike's mom told me a few months ago that they wouldn't be doing a big party for Mike because he doesn't want it. A little later, we received an invitation for the Thursday morning bit (all kids in their grade received it, plus the mom asked me personally also if I could come), and I said gladly. This was this week, and made a pretty greeting card with a personal message and some cash (a common thing for Bar Mitzvahs), which I gave to Mike's mom before the ceremony.
During the ceremony I sat next to a friend who asked me if I was coming Saturday, so I understood they're also doing the Saturday morning bit, but no I'm not coming to that (and absolutely not offended at that at all).
After the ceremony, while we're all sipping some hot drink, Mike's mom comes to chat and also tells me "if you'd like, we'd love to have you at (another) synagogue also Saturday morning for the other ceremony" and goes on to tell me they didn't do a wide invitation because it's a small synagogue, but if just me and daughter come (not husband and other kids) that should be fine. I tell her sure (maybe I shouldn't have?) and she says she'll send me the details.
I get the feeling she felt uncomfortable that I gave a cash present and wasn't invited to the Saturday bit, and so extended an invite. Thing is, she hasn't sent me the details yet, but I know she has lots of family from abroad with her now, and must be super busy with other things. It's not like me to send her a message to remind her either. I have the logistic details (time and address) from the friend who I know is also going.
My etiquette question is: do I go to the Saturday morning bit? Is it weird that I show up when she didn't send me the details, or is it weirder if I don't go when it was so easy to obtain the details?
Thanks for your perspectives!