The Pegasus website shows 5:30 in the "in store event" section of their website where the calendar is located. So you are saying they updated their FB page but not their website?
I don't want to have to race there after work if I don't have to, an extra 30 minutes will make a big difference and if it does start at 5:30, I don't want to show up at 6:00 and be 30 minutes late.
Instead of speculating which calendar is right you can give them a call +1 (608) 833-4263. But since the last they posted anything about what time it started was 6pm and they also mentioned that it was changed in their FB post I'd go by that.
Don't you get off work at 4pm. How is a 10min drive going to cut it close even if it did start at 5:30.