Other than the Enumclaw games:

The annual National Tartan Day celebration @ the Puyallup Fairgrounds in April

Bellingham HG at the beginning of June

Skagit Valley/Mount Vernon games in early July

Tacoma HG (sometime during the summer - don't remember exactly when)

Whidbey HG (mid-August - one day event)

Kelso Highlander Festival (about a weekend ago)...

Those are the ones that come to mind.

There are more games and other events listed here: http://www.usscots.com/events/dates/geographical.html

-J