+------------------+
                                                                       v                  |
             +------------------------+     +------------------+     +------------+       |
             | MemberEventGroupOption | --> | EventGroupOption | --> | EventGroup | <+    |
             +------------------------+     +------------------+     +------------+  |    |
               |                                                                     |    |
               +-------------------------------------------------------+             |    |
                                                                       v             |    |
             +------------------------+     +------------------+     +------------+  |    |       +------------+
             |      SignupOption      | --> |      Signup      | --> |   Member   | <+----+------ | MemberJoin |
             +------------------------+     +------------------+     +------------+  |    |       +------------+
               |                              |                        ^             |    |
               |                              |                        +-------------+----+----+
               v                              |                                      |    |    |
             +------------------------+       |                                      |    |    |
             |      EventOption       | ------+--------------------------------------+    |    |
             +------------------------+       |                                           |    |
                                              |                                           |    |
                                              |                                           |    |
                                              v                                           |    |
+------+     +------------------------+     +------------------+                          |    |
| Role | <-- |       MemberRole       |--+  |      Event       | -------------------------+    |
+------+     +------------------------+  |  +------------------+                               |
                                         |                                                     |
                                         +-----------------------------------------------------+