Decorated model dragon boats, 7 to 9 inches long, are balloon-propelled across an 8-foot pond in this competition modeled on a colorful traditional Chinese spectacle from 11:30 a.m. to 1:30 p.m., Saturday, June 11. Chinese tamales are sold for lunch. $15; $10 member. Boat kits are $20; $15 member. $5 to compete with an existing boat. Proceeds benefit the seniors' program at the center. Call for more information.