The summer is long in South Florida, but at this series produced by the City Theatre group, the plays are shorts. Summer Shorts, that is. The nearly four-year-old festival that celebrates five-minute dramas may indeed present several dozen Florida and world premieres of tiny works, but the producers don't skimp on quality. Each playwright (last year there were more than 500 submissions from around the nation) gets a fully staged production, featuring Equity actors and directors. And each actor gets an original comedy or drama in which to perform. Audience members, however, reap the greatest dividends. Summer Shorts' programs of micro-minute plays, normally opening early in June, and accompanied by a picnic dinner to which you may wear, well, shorts, are a tradition that keeps us going through the summer, and anticipating the riches of the summers to come.