this happened to me, too, once.
i asked on this website and apparently people should telephone first to check that it is on, as in some cultures, things get rescheduled and people are only informed by word of mouth.
in my previous church, there would always be people hanging out in the church building on a saturday, so even if it was rescheduled, there would be someone to have a cup of tea with. in my current church there are less people that go to vespers, so it is sometimes rescheduled. i am working on increasing the communication, but it takes time...
may God console u and don't give up.
and welcome, ava, stay close to God too.