There's a logical error on the Group Activities List. You can create a Group Activity and replicate it for tomorrow, but the Group Activities list only shows by default current and past events. The only way to get it to show future events is to set the date filter to "All" because if you set it to something like "1 Week" it's actually showing the PAST week, rather than records WITHIN 1 week. I don't really care how this gets fixed but it's a common annoyance that often results in people believing that the replicate function isn't working and them replicating events like 2 or 3 times, and Group Activities cannot be deleted.