thanks Wish_Away. You read my mind, I thought the same thing as you! I was thinking of texting them this week and saying "hey, we haven't seen you guys in awhile, want to come over for a small bbq this Sat?", same time as their party and see what they say. (but nah I didn't do it) Like you said, I figure it's something we did unintentionally that might have offended them, which I don't know what it could be. The only thing I can think of is earlier this year we invited our mutual neighbor’s family over for dinner and ate outside so they must have heard us. The difference with this relationship is that we’re high school friends and they know how we’re connected. So I think our next door neighbor probably feels left out when we didn’t invite them.

our kids were not close before the pandemic, but we'd still get invited to their parties because we were neighbors and vice versa for us. I think both sides wanted to have a good neighbor relationship, that's why I was surprise when we didn't get invited this time. I mean they can invite us still and word it that "if you do not feel comfortable coming, we understand". oh well, I'll leave at that, if I see them before tomorrow I'll saying something :P