Do you have electricity available? One of the biggies at our family reunions is always scalloped or au gratin potatoes. You could have them in a crock pot, or in one of those pyrex dishes with the insulated carriers. (I love those things, they really work well, in my opinion.)

I'm assuming you already have plenty of potato salad, macaroni salad, baked beans, chips, etc. How about a 7-layer Mexican dip and chips? Or is that already covered? Hard to make suggestions without knowing the family. Is it big? DH's family reunion is so big, that it's really hard to think of anything that no one else would bring. My family, on the other hand, would not be a problem (if they ever had a reunion).

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Linda