Check out a new website called Extraordinary Mama!   They are a local mom-run company that creates filtered activities calendars for families and also for nannies!    Their criteria for events are that they be fun, family-oriented and free or under $40 for a family to participate.  It is a subscription site and costs $25 for a year.  Right now they focus primarily on Eastside events, but are adding Seattle in the near future.   You can also find them on Facebook.