Make sure your character level is up-to-date (my account->characters) when trying to sign up for an event!!

If your character's level is too low, you might not be able to sign up for an event, since the level might not be appropriate for the event.

Especially with the level cap raise, make sure it's up-to-date. For example: you cannot sign up for the watcher event with that char, if that character's level still has the value 50. 

To join an event, you must first create a character (click create -> character and fill in your data).  You only have to do this one time. After that you can join any event by clicking on the little pencil next to the icon and choose which character you want to enter.

Only sign up if you are going to show up please!