Sample Calendar

Summer
July - set the Fall calendar of events

Fall Semester
Social Event - 3rd Weekend of September
Campout - 3nd Weekend of October
Service Project - 2nd Weekend of December
December - set the Spring calendar of events

Spring Semester
Social Event - 3rd Weekend of January
Service Project - 3rd Weekend of February
Campout - 3rd Weekend of April

You set your own calendar. You are not limited to this, but this is good at a minimum. Communicate with coaches and sports leagues to coordinate as much as possible. If you get the calendar set early, you are much less likely to incur conflicts. Having said that, not everyone can always participate, and that is okay.