Traca, your contribution would always be welcome at my party, just not your money..
As for potluck vs. control freak it's not really an LA thing, in fact people are mostly pretty casual down here, and when guests offer to bring things I usually say, "sure."
But once in a while, for special occasions, I want to plan a menu start to finish, considering each dish in relation to the whole. Like the wedding you just did--working on the menu ahead of time and planning out the execution and presentation--it's a creative expression. For those times I tell people the food is all taken care of, how about some wine?