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)
11:20-11:40 : Group 8 (Laurens & Simon)
11:45-12:05 : Group 3 (Tom & Jorn)
12:10-12:30 : Group 4 (Dion & Cas]
Lunch
13:30-13:50 : Group 17 (Josef & Tijn)
13:55-14:15 : Group 7 (Gijs & Casper)
14:20-14:40 : Group 9 (Patrick & Walter)
Break
14:55-15:15 : Group 10 (Maximilian & Ysbrand)
15:20-15:40 : Group 6 (Luca & Razvan)