What an incredibly informative site!

Please help me scale this menu for a house party of 120 that starts post-dinner at 7 pm. Guests will be imbibing alcohol so I've aimed to make sure that the menu is substantial enough, as well as accommodating gluten free, vegan and vegetarian guests . At your earliest convenience, any advice that you have would be greatly appreciated, and I'm happy to contribute a donation.

-Vegetable Tray-will scale according to your sample veggie tray for 25-30, multiplied by 4

-Pita wedges
-Gluten Free Crackers

Dips:
Hummus
Spinach and Artichoke dip

Spanikopita Triangles- 100
Cocktail Meatballs- 200
Baked Falafel Balls- 100

Quinoa Salad- 20 lbs
Caprese Pasta Salad- made with 7 lbs dry pasta

Lasagna Bites- 120
Beef Tenderloin and horseradish mini sandwiches- 20 lbs beef
Sweet Potato and Black Bean burrito bites- 100

-Pita wedges- allow 1 per 3 people, cut in 6 wedges. There are some attractive veggie ones that can add color to the tray.
-Gluten Free Crackers- about 6 pounds assorted

Dips:
Hummus- 1/4 cup per person. Lovely and authentic to cover it with tiny "scales" using the tip of a spoon, then drizzling in a bit of olive oil in each, and sprinkling with red sumac (or sweet paparika?)
Spinach and Artichoke dip-1/4 to 1/3 cup per person

These are short
Spanikopita Triangles- 100- I would do 200-250
Cocktail Meatballs- 200- 13-14 pounds, about a gallon of sauce
Baked Falafel Balls- 100- 2 per person and have a tahini dipping sauce, 1 cup per 6

Quinoa Salad- 20 lbs- OK
Caprese Pasta Salad- made with 7 lbs dry pasta- OK

Lasagna Bites- 120- 200 at least
Beef Tenderloin and horseradish mini sandwiches- 20 lbs beef- good,, should make 200 bites, consider putting mayo and horseradish sauce on the side
Sweet Potato and Black Bean burrito bites- 100- 150-200

Meyer Lemon Bars- 120
Brownies- 120-
cut bars smaller and have 180-200 pieces
Chocolate Chip Oatmeal Cookies- 120

Consider adding a fruit tray, the deluxe tray for 100 would be fine here.

Add dinner level coffee at least the last hour- see the beverage planning page.

This would do for about 3 hours, you won't have any left- if longer, add some more-