If you were not an initiated member of the first AOII chapter then you will need to either go through Spring COR, Spring Recruitment, or wait until the fall. I know my chapter of AOII has taken "transfer" sisters from other universities and colleges. Since I've been chapter adviser we have had two sisters from other chapters join our chapter. I also know we might have one more transferring from a chapter in GA. But back to your question, have fun at the dinner and enjoy yourself, but you will have to go through their recruitment processes or COR processes.
Good Luck!