I'm almost positive this is a silly question.
I'm very recently engaged, and my parents would like to throw FI and I an engagement party. I've accepted their generous offer, but under the condition that it be small and low-key and that we invite immediate family only (parents, siblings, grandparents, aunt/uncles, cousins). Immediate family for us is still a lot of people and FI and I really don't want a big thing. My mother, however, seems insistent that we need to invite the bridal party, who will be mainly friends. We haven't chosen our bridal party and don't plan to until we're a year or less out, which won't be for a few months after the party, and since mine and FI's family/friends are from opposite sides of the country I'm sure all or most of his BP wouldn't be able to make it and I'd feel really guilty about having all of my bridesmaids there while FI has no one.
Is it rude not to invite the bridal party to a family only engagement party (and I use party loosely--it will probably just be a dinner) if they haven't been chosen yet? I know it's a little odd that they'll be in the wedding but not at the e-party, but is this actually a breach of etiquette?