A Deli Tray from a larger grocery store is my staple for the pot luck party. Like you, I can't cook worth beans and rarely have the time to try. Seasonal fruit trays are also welcome and not too pricy. If there is a hostess to this party, you will win major cool points by bringing a few flowers for her table. Those are pretty inexpensive at the grocery, too.
That said, you have been invited and it's your company that is wanted, rather than what you can bring. Just do what you can that is a reasonable expense for you.
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