Play-Well TEKnologies offers engineering parties for ages 5 and up centered around building with LEGOs, which allows the kids to keep busy, be creative, and offers hands-on learning. Free play with LEGOs begins, and then instructors lead the kids in a 1- to 2-1/2-hour project. Some of the projects include a simple belt and pulley car, race cars, battle track, catapults, and robo bots. Parties can be either at your home or other party location, or at their site at Marin Engineering Center in San Anselmo. Prices range from $200 at your home or $260 at the store location. For more info, call Aleta Walsh (415) 460-5210 or email .