Put Will Shakespeare’s Twelfth Night, or What You Will, in the hands of the junior corps of Twin Beach Players and what do you get? A celebration performed by actors who seem to be playing for the joy of it. The Players’ uninhibited festival of uncertain purpose may be just what Shakespeare had in mind.     As a performance in a carnival spirit, this party is appropriate, given that for Shakespearean England the 12th night after Christmas was occasion for a no-holds-...