If someone wants to ask for permission (or feels they need to, based on their judgment; Ashren Snow's example of people sitting by themselves in an isolated area is one time when you might want to, IMO. I know I probably would in that instance), then sure, that's fine. There just should never be an expectation that people do that when they see a group RPing in a clearly public location.
The Freelance Wizard
Quality RP at low, low prices!
((about me | about L'yhta Mahre | L'yhta's desk | about Mysterium, the Ivory Tower: a heavy RP society of mages))
Quality RP at low, low prices!
((about me | about L'yhta Mahre | L'yhta's desk | about Mysterium, the Ivory Tower: a heavy RP society of mages))