When the game tells you something is urgent, it’s usually lying. You have all the time in the world, and nothing to fear from a long rest.
The only exception to this that I encountered was in the underdark. You take a boat to an area with an optional quest to rescue some gnomes (or dwarfs?). Forget exactly what I did (long rest, or taking the boat back again) but the gnomes had outlived their usefulness by the time I got back to them.
Pedantry:
I can buy all the drinks I want at a bar. I'm just not allowed to consume them myself.
No bar is going to eject someone just because they're buying drinks for other people.