1st birthday

Originally we weren’t going to do a party for our son, just a dinner with the grandparents. But I’m thinking of doing a little bbq in the backyard and basically it will be a party for the adults in our life who have been there for us (wedding, pregnancy, birth, etc). They are mostly family and work friends. They can obviously bring their kids if they have them. ANYWAYS, is it lame that instead of them bringing a gift (which id never ask for but people will) we state in the invite to bring lose change for his piggy bank? I thought we could have a “gift” table set up with it there and we are getting him a gift to unwrap. This is his piggy bank, but with his name on it lol Colton. ...sorry if this is a stupid post but I want thoughts !!!