Problem signing up for event

Hi, I am fairly new 50. I was going to sign up for the 3:00 Saturday Oct. 22 Random Tier 1 and tier 2's for gearing up. I tried to sign up and it told me I didn't have any eligible characters. I tried updating my character to tier 2 raid ready (just to see if it would let me sign up) but it still wouldn't let me sign up. Is there a special requirement I am not meeting?

The event you are trying to sign up for is a Defiant-side event. You can tell the difference because it is listed in red on the calendar (Guardian is blue, joint events are yellow). If I remember correctly, I think your level 50 character is Guardian.

Ohhh... Well, no wonder. (hehe) I guess that means I just need to lvl up my defiant. Thanks!