You do not have to go before 2. DD did this. She literally just went to DHS at like 5pm for some Starbucks to tap in and then came to 7pm dinner at Le Cellier with us.
I tried to just change her APR but the only park with no availability that day was Epcot!
Great-thanks! This will be so helpful! 
Just made 8:45 Oga’s ADR after park closing! So excited to be in HS well after close and to see GE at night. We will have our car there, and I’m wondering if we should drive to the park that day or take Disney bus. This is our arrival day. We will have driven about 3.5 hours to arrive at CSR around noon and plan to go to Hs around 3:00 after either relaxing in room (if ready) or relaxing around the resort.
I would take the bus if you plan on hopping in the car right after the bar it might not be a great combo.
I’m not a drinker and we will have DS12 with us. DH, I’m sure, will have something alcoholic though.