A popular summer event is set to return to Milton this year. Blenko Glass Company said it is bringing back its Festival of Glass after a two-year hiatus. The festival is scheduled for Aug. 4-6. The long weekend event offers glassworking classes and live demonstrations of technique from local and regional artists, auctions for specialty and one-of-a-kind pieces, a vintage glass sale, food trucks, local vendors and artists and live music. There will also be a chance to work alongside skilled craftsmen to make some of the glass products. On Saturday, Blenko’s factory campus will be open to the public for a day full of classes, demonstrations, food, drink and music, the company said.