Welcome to YorkieTalk, Henry's Mom! Glad to see another Seattle person around!
Yorkie meetups are just playdates for our Yorkies, where the Yorkies get to meet each other and the Yorkie parents get to socialize and talk Yorkies...
The Seattle ones are every third Saturday of the month. More details available here:
http://yorkie.meetup.com/258
The next meetup is THIS Saturday (hopefully it won't rain) at Magnuson Park's Small/Shy Dog area of the park at 1:30pm.