Good morning, Gustavo;
One of my favorite coffee places when I am driving between Seattle and Portland is the Starbuck's northeast of I-5 and South 72nd Street located on the northeast corner of S. 72nd Street and S. Hosmer Street, the first traffic signal on S. 72nd Street east of I-5; get into the left turn lanes.
Perhaps some of the other PNWRG APUG people in the Latte Land area might like to meet there also. That particular weekend that you mentioned (around the 28th) is also the time for the Seattle Boat Show, and I will be working there some of the days. Let us see what others think would be a good date and time.
Enjoy;
Ralph
Latte Land, Washington