I’ve written on the importance of keeping a level of continuity over Christmas (and summer break) with students. Good shepherds don’t get to fully withdraw.
But it’s important to think about where student leaders fit in this goal. Whether your structure involves small group leaders, ministry team leaders, disciplers, or any other student ministers, they can (and should) help connect with students over breaks.
If they’re directly ministering to students anyway (like in small groups), then let them come up with their own plans that fit their crew. Others may need a plan laid out for them or at least brainstormed with them.
But then – whoever comes up with the plan – you’ll want to hold them to it. All of the students (as well as the staff) will be busy at points, and “out of sight, out of mind” is a constantly tempting enemy.