Free: Contests & Raffles.
Being Fairbanks is a bit more inland than say Anchorage you probably will be a bit early for the silver run. I know on my sheep hunt out of Anchorage we did quite well on the silvers in mid Aug. Probably worth your time to make a phone call up there to one of the Sporting goods stores.
Wait till you get up there and ask at a local sporting goods store or where you are staying. Regs and run timing differ a lot from area to area just like here and local knowledge is best.
I can ask my sister she lives in Fairbanks. She goes to fish camp late summer early fall but that's another 200 miles north.
You might try on the Alaska Outdoors Forum fishing section and ask there. A lot of those guys live up there and could probably help you out.