spring rush/open rush

I transferred in super late and was unable to rush. I really am so interested in Greek Life and would love to get involved. How do you get a bid in open rush or spring rush? I'm just hesitant to rush in the fall because I will be a junior/senior (depending how hours go and what all transferred etc). I know upperclassmen do rush, but I would actually like to enjoy an experience of being a little, big, and etc. I would love to fill really involved instead of feeling like I was not involved for long.