Due to a rise in demand for tickets, the Diabetes Research Institute is moving its Hamptons benefit, An Evening Under the Stars, featuring Diana Ross, from a private residence to Stony Brook Southhampton, formerly Southhampton College. The August 25 private concert was to be held at the Quogue home of Jill Viner and and Cliff Viner, but the switch allows the organization to double its capacity to 500. The event is being designed and produced by the Miami-based events firm Barton G.