When my son was younger and at day care, there was a dads day, needless to say, I didn't want to go, but I did as I always do my best for my sons.
I felt uncomfortable straight away, all the dads chatting, drinking coffee in there suits... Me in.. well comfy clothes.
My son wanted to show me what he did at daycare, so we proceeded to make the biggest train track we could out of the pieces, it wasn't long before all the other children joined in as we lay tracks and pushed the trains around making train noises, I was even crawling around on the floor to play.
I enjoyed every minute of it, anxiety went out the window!
The other dads didn't seem that impressed but one of my sons "teachers", said it was nice to see a dad interact with the kids, after that they (kids) always asked my son when I could come back and play with them again.
My GF describes me as a 31 yr old kid, I have grown up enough to survive in this world, but I'm the biggest kid at heart and she doesn't want me to grow up.