We are hosting a two day event with 6 sessions over the two days and half hour breaks in between. Attendees will likely be joining and leaving the event multiple times over the two days. How do we set up registration we can track attendance, but also allow attendees to join the meeting multiple times over the two days? Also, can we close the meeting at the end of day one and start it again on the morning of day two -- or do we just need to leave it open all night? New user -- thanks for your help!