You won't be cooking all the meat at once anyway, right? So you can freeze what you don't cook.

Figure on some leftovers of the other foods, though -- you don't want to run out. I love to eat leftovers, but if you don't, see if there is a local shelter that will take them.

Cooking for 50 people is a lot of grillingand unless you have one heck of a grill, will take more space than you can cook on at once. If I were you I'd grill them before hand and keep them warm in the oven. Take them out and put on a platter to serve. Saves you from cooking them for an hour while guest are there.

But....people won't all eat at the same time. And it's part of the fun to have people standing around the grill waiting for their meat to be done.
I have a standard Weber kettle and it can do a dozen burgers easily...they take about 10 minutes....so that's everyone fed in an hour.
If you have a larger grill, its' a piece of cake.
you don't want to plan for a huge platter of burgers and dogs all done and re warmed at once...
I doubt that she will be plating in the kitchen ands erving every one...it will be buffet and paople will be chatting and drinking wine or pop and talking...
Sounds like a good party to me!
Linda C

DH (aka the griller) asked me to cut out a paper sample burger and measure the grill -- it will hold 15 burgers. Our neighbors across the street have offered to wheel their grill over if needed, so I think we'll be fine.

Linda C. -- if you're anywhere near Northern Virginia, come on over and join the fun!

Thanks to everyone for all the good advice.

The party is over by now and I would be interested to know how many people showed up and how much they actually did eat and drink. I have kept records over the years so I know for next time.

Marge727 - Yes, the party is over and it went very well. We had plenty of food, and some left over (now in the freezer for Labor Day weekend picnic). I didn't get an exact head count, but it was between 45 and 50 adults and teens.

purchased 48 frozen burgers - 40 were cooked and eaten
purchased 48 hot dogs - 18 cooked and eaten
purchased 12 lbs. potato salad - 8 lbs eaten
purchased large fruit tray to serve 35 to 40 - all gobbled up
quadrupled homemade baked bean recipe to serve 32 - approx. 1/2 eaten

Thanks for asking!

thanks, because I am having a party about that size and its nice to know that the hot dogs were also eaten. Nice menu. I just had a party this past weekend and baked cupcakes. I frosted them 3 different ways and they all got eaten quickly.

Im having 75 people i need to know many hamburger and buns and hotdogs and buns