You could write this on a small paper and add it to the invitation; A bag of diapers for lil ol' me, would sure help mommy and daddy to be. It's an optional game, please don't feel obliged; but for every pack you could put your name to win a great prize!
Instant Download Royal Blue Prince Baby Shower Diaper Raffle Cards, Printable Prince Diaper Prize Drawing, Crown Theme Baby Shower 66C by Studio20Designs on Etsy https://www.etsy.com/listing/223491339/instant-download-royal-blue-prince-baby
word watcher- students fill out a ticket when they find a vocabulary word during reading; pull tickets for raffle drawing. Saw this in a classroom - students had to tell teacher the meaning to get the ticket.