Group 1 will be kids last names A to La.
Group 2 will be kids with last names Li to W. 

Here is the schedule for the afternoon:

4:00pm - Check-In begins for Group 1
4:30pm - On the ice for Group 1
4:50pm - Check-In begins for Group 2
5:15pm - Group 1 exits the ice
5:20pm - On the ice for Group 2
6:05pm - Group 2 exits the ice