Phish has a song named 'Wilson' and they thought it would be great if they could get the Seahawks fans to do a the chant that every Phish fan knows well when that song is played.  So Phish pushed the Seahawks fans to get the entire stadium to chant 'Wilson' as a show of support for Russell Wilson everytime he took the field.  This turned into a full fledged cheer, so much so that coach Carroll would call up and ask for the opening chords of the Phish song to be played on the stadium speakers so the crowd would chant 'Wilson'.  

The NFL did a short film on it which you can see below.  

As a dedicated Phish fan and San Francisco local I think it would be a gesture of good will for Phish and the SF Recreation and Parks Department to schedule a Phish concert at the Stick before it gets destroyed for good.

Watch below-->

NFL Films Wilson Phish and the Seahawks