When I was little one of my friends invited me to her birthday party.
That's cool and it seems like a nice gesture. Was she a school friend?
She's my friend from primary school. I spent a lot of time with her. This is a good memory.
I'm glad you went to the birthday party. I'm sure they really appreciated seeing you there.
Maybe I'll go if I'm not busy that day.
As long as you're not busy and I don't see any issue with you going. Like I said just focus on them being happy that you actually came.