Yale will join the City of New Haven in cosponsoring one of three concerts being offered on the New Haven Green during the month of July as part of the annual New Haven Jazz Festival. Dates for the Saturday night concerts are July 13, 20 and 27. Concertgoers are invited to picnic on the Green; food will be available from vendors. This year's performers, and the date of the Yale-sponsored event, will appear in a future issue of the Yale Bulletin & Calendar.