Ok does this sound like a crazy schedule, or is it just because I'm a home body? Here are our xmas holiday plans...
Dec 24
late morning celebration at my parent's. It's just with my parents, my sister and maybe her bf.
evening celebration at my aunt's. Easily 30 people. Least required to go to, but most fun.
Dec 25
late morning celebration with FIL and sMIL.
late afternoon celebration with sFIL and MIL. Large family party, probably 20 people.
Dec 28
xmas celebration for my mom's side. Probably 25 people. Least fun, most required. Most of the family I see here I will have seen at aunt's party on the 24th.
Dec 29
engagement party for my cousin. Do these things really happen?? Are gifts expected? By the way, same exact people I will have seen on the 24th and the 28th, although obviously the bride's family/friends will be there too.
Jan 4
xmas celebration for my dad's side. We see them maybe once a year. 40+ people, although a good time.
I think my biggest issue is seeing my mom's side of the family on 4 separate occasions. If I could pick and choose, I'd just do the two things on xmas eve, but seriously sooooooo much guilt if we don't see them on the 28th. Is it rude to decline the engagement party? No plans just, really, I need a break.

Re: Christmas is insane around here...
I think people do expect presents for engagement parties. I couldn't make one a month ago and after looking at the pictures I'm wondering if I should have sent a present. I'll see the girl in person over Thanksgiving, so I'll give her something then. It looked like their engagement party was bigger than our wedding.
I wish I had the guts to tell my mom that we want to stop going to her house on xmas eve. She wants to keep it going because that's what we did as kids, but we don't live there anymore. We don't even live nearby, we're an hour and a half away.
I think we are going to decline the engagement party. Dh isn't up for it either.
It sounds like skipping the engagement party is a good idea. Good luck with everything-the holidays can get so hectic!
Another vote for too busy. Our families are out of town so quiet Christmas morning for us. Last year we travelled which was nice and an exception, but not really fair to expect that every year. It is tough the first year we did it but fine after that.
I would also skip the engagement party and just send a present, they are not really a thing around here so I might not be the best judge but no one has had one in my circle or relatives or friends.
Wow! When DH and I were engaged, I remember going to six houses in two days. We said "never again."
I would definitely cut some of that out.
No idea why they want to be special snowflakes and have an engagement party. I have zero doubts that there will also be at least one bridal shower. I personally think it's rude to have that many pre-wedding celebrations where gifts are expected. Maybe that should be my FFFC.