Polaris, Darkness War and Hell Raised.
No requirements other than having the Gatekeeper beaten.

DPS DABS or SF (untested)

Signed for the raid, but I'll come along if not picked. DPS or heals.

If you either moved the start time up two hours, or bumped it back an hour for after the NYR you'll likely get more signups Trom. If your schedule is pretty set, I'd suggest trying these on Wednesdays in the future, or possibly pugging the rest of the group for an HE run, then get cabal people for 18s once the NYR is done.

start/end times as well as the particular dungeons are debatable.