I would like you to come to my flat on Saturday to celebrate my birthday. I am organising a party at 6 p.m. A lot of my friends are coming and it's going to be great fun. Please let me know if you can be there.
to organise - organizować
to celebrate - świętować
a flat - mieszkanie
fun - zabawa
I would like - chciał(a)bym
a lot of my friends - wielu moich kolegów
let someone know - dać komuś znać