you can join the walk up list (if available) but doubtful during "these times" that you can walk in to the bar. Keep trying for every day if you have PH. We were able to get a reservation on our AK day for 5pm. HS was sold out that day. We arrived @ HS around 3pm and were not turned away. Good luck.
I waited about 45 mins and yes it was so worth it! It was one of the few places in all of Galaxy’s Edge where I actually felt like I was in a “Star Wars” location or on the set.
We had ressies....but they were for standing room only....I have difficulty standing and I walk with a cane....so I asked if they had a table....instead, they moved us to the bar stools....was definitely a fun visit....