There will be lots of parts, clothing and complete bikes and frames for sale. The really good stuff goes early but there are usually lots of bargains. They aren't doing it this time but in years past, you could consign a bike for a minimal charge + a % of the selling price if it sold. This also got you an entry ticket so you could get in on the early deals. After a few hours, prices on remaining stuff gets slashed, sometimes drastically & you can haggle to your hearts content.
I am so busy with our new home, and its so far to Seattle now, that I will probably not go for the first time in years. Don