It makes sense, but I noticed a couple of things that could be corrected... This is just to let you know that we got invited to a costume party TOMORROW. There will be pumpkins for people to carve, and lots of other fun crafts. There will also be food, but they would like us to bring something to represent our country or something we really like (although it's not not necessary). I am going, so please let me know if you are interested. and maybe we can go together.

It's good but this is better. Just to let you know we were invited to a costume party TOMORROW. There will be pumpkins for people to carve and lots of other fun crafts. There will also be food, but they would like us to bring something to represent our country or something we really like (it is not required). I am going, so please let me know if you are interested so we can go together

Yes it seems fine..