make the heart out of paper and write the "save the date" on it, both of your initials and the date super simply, and then the actual wedding invitation with it! then they can put the real invite somewhere nice and the little heart paper on the fridge!
Greenery and Candles Centerpieces //Celebration Flair
31 Impossibly Fun Wedding Ideas: instead of a kids table include a small bucket of crayons and coloring books on each table, with a sign that says "for kids and adults who love to color". Or something similar to that phrase:) kids area, let them be free!