Starting in March at the WaterTower Theatre in Addison and extending into late October at the Samuell Grand Amphitheatre, the Shakespeare Festival of Dallas is inching toward becoming what everybody wishes it could be--a year-round celebration of Elizabethan theater. But the two best months, for our money, are still June and July, when the festival is doing hard-core Bard for the masses out on the blankets in the grass at Samuell Grand Park in East Dallas. Acting, directing and all-around production values in recent years have been of ever better quality. And there's nothing better, when the sun finally falls on a white-hot Dallas summer day, than a good bottle of wine, a few friends and The Winter's Tale.