There’s really not much you’ve missed. The arrival day was just the first interactions for characters. Not sure if there’s anything notably important in those conversations. But now that it’s the official day 1, the first date is happening. Tomer with Amberleigh, and Avery with Phoebe.
So the other characters have their day free to mingle, and vote on which couple should enter the truth booth.
You can vote for the truth booth here.