Anyone who has hosted a good dinner party knows that the guest list, table setting and topic of conversation play a big role in determining whether the night is a hit or the guests leave angry and unsatisfied. That concept is about to get a true test on the Colorado River, where chairs are being pulled up to a negotiating table to start a new round of talks that could define how the river system adapts to a changing climate. Decisions on who gets to sit at that table, whose interests are represented…