Here's the information from SoundersFC.com.
adidas is hosting the ultimate Chelsea FC Fan Fest on Friday, July 17 from 4:00pm to 6:30pm, at Qwest Field in preparation for the team's match against the Seattle Sounders on Saturday, July 18. By attending the event, fans can gain access to the Chelsea team practice at Qwest Field.
The first 500 fans to arrive will receive Chelsea FC scarves and everyone in attendance will have access to Chelsea's practice session at 5 p.m. Attendees can enter to win Chelsea FC jerseys and several lucky fans will win ticket packages to the nearly sold-out Sounders vs. Chelsea match.
Fans may enter the stadium through gates on the north end of Qwest Field.