How to make going to a party where you don’t really know anyone, even the host, not awkward?

Back in late March, I joined a friend meeting app that matches you with people for dinner and then has you do an activity with other groups since I had recently moved to a new city. Anyways, I clicked with a few people from the group/other groups and around 10 of us made a group chat. Occasionally someone would speak in it but it’s been pretty dead. Last week one of the guys invited us to a party he’s having and I still don’t have a lot of friends in the area so I RSVP’d but no one else in the chat did and looking at the guest list (25 or so ppl), it seems like him and his roommates close friends.

My friend from HS who also lives here now agreed to come with but I’m so anxious and scared the guy won’t remember me or be like who are you? I could be overthinking this but is it weird or how to not make it awkward?