We're invited to my H's step-sister's son's bar mitzvah. For a little background, my MIL married step-sister's father when H and step-sister were adults. They did not grow up together. We're not super close with them, but my MIL is. (Step-sister's father passed away a few years ago).
We received the invite yesterday. The services are at their temple on Saturday as expected. But the party is the day after, Sunday. Any bar/bat mitzvah I've attended had all of this on one day. So on Saturday we're expected to be at temple from 9am to 1pm. And then Sunday, the party is 12pm to 5pm. Do we really have to attend both? Is it OK to skip temple and just go to the party?