The day we can fit most people in are Mondays followed by Friday and Sunday.
So before the season starts that would be
Monday the 20th / Friday 24th / Sunday 26th
Monday 27th (bank holiday) / Friday 31st / Sunday 2nd
Monday the 3rd
I think 2nd sept is good the later the better, with two weeks of pre season still to go and with starters playing in the first quarter of games injuries do happen. Best to have the draft after pre season having an injury free roster