Hi

Um, so I'm not sure if this counts, or if this is insignificant compared to others' problems, but here goes.
So, um, me and one of my best friends (lets say A) were getting kind of annoyed (not like, properly!) because someone (a friend, lets say B) was singing this really annoying song. I joked that I was going to steal one of her things and walked out and moved her bag to a further peg on the same wall that it had been on, and went and sat down. B looked really angry and went in the direction I had come, while A and I laughed about what I had done. B called A an unnecessary name and then the school bell went. Oh- B also kind of hit me on the head (not like SERIOUSLY hard or anything but tbh it kind of hurt a little when she did it- and you can't say that that was in any way necessary). When I went to get my bag, I saw she had moved onto the floor, a little further than where I put hers (haha, very funny. I wasn't mad at that, it was just kind of amusing- after all, imitation is the highest form of flattery!!

)
So A and I usually try and annoy B- not in a mean way, just teasing or joking about something like friends do. And sometimes B would overreact and sometimes swear a little. But then the thing that annoyed me is that B would just forget what had happened after like no time at all and pretend everything was fine. I mean, if she had just sworn at someone I don't think she should just act as if nothing happened?? IDK. And then we'd be fine again and then B would get annoyed again- a cycle.
But now it's all confusing because I'm having a birthday party at the weekend and I don't want anything to go wrong. There's already an argument going on between 2 people that are coming, I don't want there to be another! Especially as it's my party, that would be really awkward. I don't want any tension!! It's a party!! But at the same time, I don't want to just pretend that nothing happened like everyone normally does because I don't think it's fair how B reacted. I don't want to just overlook it because that always happens! Any advice?

(oh also if anyone has any good ideas for what to do at a party...)