My advice would be to learn how to use relays to group events together so they are not all scheduled at once. But if you really want to increase the limit:
From the "Start a Game" dialog, click "advanced config" then set the "Schedules" amount under "Per-Player" limits.
Note that this will increase the potential CPU load on your server.
DO NOT set it to anything ridiculous like 999999, just bump it up to 150 or so.
