Is it possible to drop out of a tournament after it's started?

I started a Nackgammon tournament almost two years ago, and we're not even done with round 1 yet. I finished my last game months ago, so I'm just waiting for everyone else to finish now (which at this rate could take another year). I'm pretty sure I won't make it to the next round anyway, so I'd really like to leave the tournament so I can join another.

I searched around, but I didn't find much about dropping out. Is it allowed?