Shooting my first "reception"

I am shooting my first wedding reception this Saturday and need all the tips. The bride and groom are already married and had a destination wedding. They are doing a reception here with 100 people for those who couldn't attended. They only need me for 2 hours and only want photos of the entrance, cake cutting and first dance. It seems pretty laid back.

I am not having another photographer with me. I figured this would be a great opportunity to get my foot in the door with weddings. But any tips are appreciated as I'm super nervous 😬