Limit funtionality before site downtime

If there is a planned maintenance of the website it would be great to do 2 things.
a) disable creating of new speed games 30 mins before the downtime
b) disable "start turn" for casual games 1 hour before the downtime
c) disable "start turn" for speed games 5 mins before the downtime
This will remove the need to delete the games that have gone wrong. There just will be no mistakes.
a) disable creating of new speed games 30 mins before the downtime
b) disable "start turn" for casual games 1 hour before the downtime
c) disable "start turn" for speed games 5 mins before the downtime
This will remove the need to delete the games that have gone wrong. There just will be no mistakes.