Here's the word from ECS:
The 2015 version of the Cascadia Cup clash is upon us already and the Emerald City Supporters (ECS) & Fuel Sports Bar in Pioneer Square are partnering again for the largest pre-match event in the country. This event will help Sounders fans reignite the flames of the Cascadia rivalry.
On Sunday, April 26th, the ECS will continue their ongoing tradition of hosting the Brougham Block Party at Fuel Sports Bar. Located at the corner of Occidental Avenue and South Washington Street, this 21+ event will feature a large beer garden, food and full bar, ECS membership and merchandise tables, and raucous chants and songs. Festivities begin at 2 p.m. and extra restroom facilities will make this a comfortable party venue for all Sounders fans (21 and over).
The Emerald City Supporters are the largest independent supporters group of Seattle Sounders FC, and can be found at the Brougham End of Century Link Field during every Sounders home match.
Drumming, singing, waving flags, displaying tifo, and cheering on the Sounders, “The Brougham Faithful” create the best game day atmosphere in MLS.