Gion is better known for his role in the BJM documentary Dig! than for his prose, which makes this worth showing up out of curiosity if nothing else. Reading series like Stir tend to run short — 90 minutes is typical, with a Q&A — and they almost always end at a nearby bar. Doors are usually earlier than the listed start time; get there 15 minutes ahead if you want a seat that isn't a folding chair in the back.
This is free, so no ticket needed, but bring cash if there's a tip jar or a book for sale at the door.
If you've got two hours: Show up at doors, grab a seat near the aisle, stay for the reading and first round of questions, then follow whoever looks like they know where the afterparty is.