My favorite holiday party is an annual open house that friends hold the Saturday before Christmas.
The house is great and the food is great, the guests dress up in holiday finery and Christmas ties, the bartenders are pleasant, the hors d'oevre waitresses are always near, the cheeses are excellent, especially the little room with the port and Stilton and cookies. Their pastor plays Christmas songs on the pianny (between cocktails), boxfulls of goofy Christmas hats are distributed, and carols are sung.
All of that is very good, but what is special is that they invite your entire family - all ages, so the place is full of peoples' kids and grandkids from 6 months to 40. Probably 150 people, maybe more, arriving, and going off to other parties. There are some crawlers underfoot dressed in their Christmas best. Balloons everywhere. That's what makes it merry, relaxed, and interesting. My kids love it, and it's a chance for others to catch up with them too.
If and when my daughters decide to tie the knot, I'd love it if they wanted to do a jolly wedding like that, with no formal sit-down, no deafening band, and with kids running around. I guess that is sort-of Mediterranean-style.