It departs 12:23 on Friday? Shows will be Friday - Sunday probably starting around 1pm, regardless of what that stupid website says. 4pm is 3 hours AFTER the shows have already started.
If you have to leave at 10pm you will have to be packed and get on the bus by 10pm. This means you'll have to leave the festival around 9pm in order to get your shit together, missing many of the big names on the last day.
Then again, it also says this: "Buses depart 45 minutes after end of Show", which would be sometime around midnight or later.
Long story short, this seems like a bad idea and I wouldn't rely on it at all.
I foresee a problem, hours after the bus is scheduled to arrive at Sasquatch it never does, days go by, rumors of the Lost Bus abound in the media, and somehow a bus full of Sasquatoons ends up in Malaysia, 10 days later.