Ben, you need to get on your IATSE Local's "casual" list. It's for folks who don't want or intend to make a living as a hand but are willing to work on 'over hire' situations (where the show needs more hands than the venue has employees). If you've never see a load in and set up, it's pretty awe-inspiring. There are a number of time-lapse videos on youtube, too.
For an arena show the day starts with the tour's head rigger and the venue/Local head rigger doing the "walk and chalk", where the rigging points are chalked out on the arena floor, the bridle calculations done and the "hieroglyphics" written next to the point locations. The first truck is then unloaded, typically with production office stuff coming off first, then chain hoists, wire rope slings and other rigging gear. If the tour is carrying its own stage, that is typically the next stuff unloaded and is sent to the far end of the arena floor for assembly (the stage is on wheels and will be pushed back to the stage-end of the arena after rigging is done and lights/video/set are in the air, usually right before the end of the 5th hour). Headline artist backline and set pieces are placed on stage before the push, too.
With 3 acts on the show, typically the headline act has a 4pm sound check, direct support (middle act) gets the stage around 5pm, and the opening act gets the stage sometime between 6pm and doors opening. On a 5 or 6 band metal show things are more compressed but the headline gets first dibs on the day schedule and everything is subservient to their uses.