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