Amy Yee has free same-day reservations, and if you book later in the 8:00 block, you should be able to find a court. I usually go there on weekdays at 8:00, as not many people show up after to bump you off, so you can get in a good 2 hours+. However, on a friday night, people might be willing to play later, so there might be a shortage of courts even after 8:00. But definitely worth a simple call to find out.
Also checkout Sandpoint, which is supposedly a phenomenal facility, but is having trouble booking courts early in the day (from what I was told), and maybe later in the day as well.