When I joined my local:
- Getting my bid
- Walking into my sorority's bid day party and promptly getting tackled by all my new sisters

- Putting on my pledge ring for the first time
- My big taking me shopping for my first letters
- Getting to bond with all the sisters, especially my pledge sisters
These are all from when I was pledging my local sorority. I think the most memorable thing about us joining AEPhi was the chance for some renewed sisterhood bonding.
(I'm treating ritual as a gimme...)