set schedules to 1000. thats the default max, and even at that level it wont lag or crash your server due to how it works. youd have more lag troubles if someone used vce on your server than if you had 1000 events scheduled to run.
if thats still not enough, theres some code you can run to jack the limit higher ingame. given that theres no limit for scripts, its kinda arbitrary that events are cut off at 1000 (esp if many bricks are involved as each one counts as one), so its understandable if youd need it