I'm no caterer, but I've had a few shin digs....
I'm not sure how you're planning to cook the pig...
If you could fit one 140-150# bone-in hog in the cooker or on the spit, that would be enough if you had turkeys too.
If a pig this size is too big for your cooker, go with (2) 80#-100# pigs, or have the bigger pig (150#) de-boned & cook it in roaster pans, in the cooker (can't do this with a spit)
....this is a good method if you don't want all the work of cutting up the pigs when they're done cooking...in the middle of the party...burning your fingers...with everyone waiting to eat....like I said, de-boned & cooked in pans is my favorite way....easier on you.
I never had turkeys at mine....I'm a pork kinda guy
I'd go with 5 good sized turkeys (15-20#?) not sure what fits in a fryer?
Along with the pork previously mentioned plus the sides I'd assume everyone is bringing, you'll have plenty of food......
...now for the drink....