Cowboy Invitations Wording My Baby Will Be A Year On The 18th Of June, Gonna Have A Birthday/baptizmal Party On The 20th Of June?

My baby will be a year on the 18th of June, Gonna have a birthday/baptizmal party on the 20th of June? - cowboy invitations wording

When should invitations? I have great family, I would like for you to celebrate this special day for my son. no idea when? and his cowboy theme!