Allison and her dad were enjoying a dance together...alone.

Boo saw what was going on and thought that looked like a fun thing to do, he wanted to dance with Allison too.

Boo was there within seconds.

"Mister, that's my new mom!" "I'm cutting in.......Mister?................Sir.........um, Allison?"

They never even noticed Boo (can you imagine?).
Consolation.

But there were plenty of people to spend some quality and quantity time with...

...and nice people he had never even met before.

All was good again and maybe Boo was in the best place he could possibly be at that minute, that day.
His new mom and dad eventually found him (you can see a hint of Boo in the lower right)...

It was an absolutely perfect day (for everyone
and Boo, since everything is all about the Boo, that's what I've heard).