If the Sounders' primary goal is to win their semi-final match, they should host the August 30th match at Starfire.
If the Sounders' primary goal is to make sure that all matches between MLS squads played on the XBOX Pitch are sellouts, they should host the USOC semi-final at Starfire.
If the Sounders' primary goal is to highlight the importance of the United States Open Cub, respect the history of the tournament, and raise the visibility of the tournament, the game needs to be played in front of 30,000+ not 4,500.
Hosting the USOC semi-final at Starfire is like hosting the a NCAA Final 4 game at a Division III gym instead of a full arena. It's like allowing an NFL team to host a playoff game at a high school to have a better home-field advantage.
If the Sounders want to treat the US Open Cup as an major tournament, the last two rounds should be hosted at CenturyLink Field. The team deemed the CCL important enough to host the matches at Qwest last year so what does it say about the club's commitment to the USOC if only the Final would be hosted at CenturyLink?
Nothing says "we want our fans to be there to support us" like limiting the number that can attend it to less than one seventh the standard home attendance. I believe this is something that Real Salt Lake got right, bidding to host the match at Rio Tinto in front of their supporters. Hopefully it's not too late for the Sounders to change the venue for the match.
The Seahawks are scheduled to have a home pre-season game on Friday, September 2nd which would give the facilities/grounds crew 2 full days between the games to switch over to the NFL lines. The Sounders have a home match on August 27th so the field will already be set up and ready to go. There are no other events scheduled that week so there is no reason I can see that it can't be done.
As for ticket sales, there is a month and a half for the team to sell out CenturyLink. Offer STH their seats at a discount (say half off), then offer the remainder for sale at 60% of face value. Modify the discounts as appropriate, but I have no doubt the game would be a sellout.
Adrian, Joe, and Co., please make this happen.
If given the choice, where do you want the USOC Semi-final game to be played:
Starfire (72 votes)
Xbox Pitch (114 votes)
186 total votes