I have a friend who whenever hosting a party it is always potluck, even say a birthday party or gender reveal or baptism. What is an appropriate "potluck" occasion? I find this a little strange. I think tailgates & BBQs is normal, but parties for your child or yourself is not normal? Am I off base?

Note: I know when I had my LO's 1st birthday both my mom and MIL offered to bring a side to help out, so I'm not thinking this. More of a "please bring a side/dessert & BYOB" on invites.