The Seattle Rep is putting on The Three Musketeers from Oct 5-Nov. 15. For the October 5th 3 p.m. staging, kids come free with each full-priced adult ticket. Also before the October 5th matinee is a Musketeers Training Camp - create your own hat, tunic and sword and learn some combat moves. You have to reserve a spot for the pre-show activities at 206-443-2222.
(Not pushing the Rep but it sounded like a good, low-cost activity for kids.)