You were Oliver Wood's girlfriend, you were both young, 15 years old but he can't wait and wanted to marry you.. so he get to Hogsmeade to buy a black suit for him and a ring.

So when You were in your Quidditch Match, He was there, watching you by the stands, and when the Match finished the Gryffindor team won, the students and Professors is applauding of course and he took the opportunity to propose.

So Oliver go out of the stands and walk over to you, all the Gryffindors and Slytherins knew that he was gonna propose already so when he's behind you, he kneel on one knee, with the ring holding by two fingers, the students, professors, Gryffindor team, etc were watching, you didn't notice Oliver.

But then a Gryffindor student tells you to look behind you, and when you did, you saw Oliver..