ATTN DEs: Training and stuff!
Basically when your character arrived, they'd have been directed to the side yard here by Nott family house elves. This was a business time, so they would have been paired off, if Patrice had not done so already, and then given thirty minutes or so to duel with that person. Patrice, and possibly any other IC DEs that happened to be there, would have circulated among the attendees and given advice, pointers, and instruction in the Dark Arts, particularly unforgivables and other spells along those lines. After thirty minutes they would have probably all just circulated to the right, or something like that, so depending on how many people were actually there your character would have probably interacted with most of the other characters there.
So, basically below maybe say if you were there today, if there were any spells or items your character struggled with, and feel free to work out which character won duels in a pairing or whatever.
Oh, and at about the halfway point basil water would have been provided for the guests, but nothing fancier. Patrice was all business today >:]