Nice try, Joe Pesci disguised as a cop at the beginning of classic holiday film Home Alone (1990).

Main holidays that my family commemorates are Easter (lunch), Christmas (dinner, lunch), New Year (dinner, lunch). They usually include things like this:

• Meat: roasted ham, roasted chicken, or some barbecue
• Carb 1: rice pilaf, or a simple white rice. Got to have it because of my mum, otherwise she bugs us to no end.
• Carb 2: cornmeal or yucca meal farofa, usually filled with sausage bits. If we're roasting chicken it goes inside the chicken.
• Salad 1: potato-mayo salad, made with homemade mayo
• Salad 2: green leaves, white cheese, bacon bits, some dressing
• Desserts: fruits salad, gelatin, tiramisu, ice cream

For reference, I'm in the Southern Cone; that's why the desserts are biased towards colder stuff. (Christmas and New Year are hellish here.)

EDIT: aaaaaaand now I noticed that I'm a muppet and the question was about who or where, not what. My bad.

I usually commemorate those holidays either in my home or my sister's home, with the family and one or more friends. Making the meal is a big deal for us, and even the cats get parts of it (Kika gets shredded chicken breast, Siegfrieda gets some of the yoghurt of the salad dressing.) Usually around 8 people.