You can reserve a demo per group per timeslot. Put your group number behind the timeslot. Example:
08:30-8:50 : -
08:50-9:10 : Group 2
Changes are logged by account. (social security)
10:20-10:40 : Group 1 (Quinten & Dimitri)
10:45-11:05 : Group 16 (Marijn & Rick)
Break
11:20-11:40 : Group 2 (Maikel, Norbert)
11:45-12:05 : Group 15 (Niels, Gil)
12:10-12:30 : Group 11 (Lars, Stijn)
Lunch
13:30-13:50 : Group 12 (Mathieu & Pepijn)
13:55-14:15 : Group 5 (Floris & Niccolo]
14:20-14:40 : Group 14 (Terence & David]
Break
14:55-15:15 : Group 18 (David & Pieter]
15:20-15:40 : Group 13 (Max & Micha)