Traditionally Nimbledons has been a program for a noncompetitive social group of seniors, superseniors & beginners at the 3.0 (approximately) level.
Nimbledons play on Tuesday and Thursday mornings beginning at 8:30 a.m., aIthough some arrive early to warm up and start playing, until 11:30 a.m.
If there are less than 16 players, then no formal procedure for time of play or mixing up of players may occur unless agreed upon by those playing at the time.
If there are more than 16 players, a new format has been put in place involving placing one's racquet in a specially designed box at the beginning of play (around 9;00 a.m.) and then drawing the racquets from the box in order and playing either a certain number of games or playing a set amount of time, after which the players immediately vacate the court, and place their racquets in either the winners' or losers' side of the box depending on the results.
Newcomers simply place their racquet in either side of the box when thay arrive if play is in progress. Then when their turn comes up (their racquet is pulled), they move to the vacated court for a set.
If a player no longer wishes to play, they simply do not place their racquet in the box.