Maybe give prizes for best hats, and make felt shaped hearts, red, pink and white for first sec and third prize ribbons. Or use them for the winners of the door prizes. That's what we do now instead of ribbons for our quilt ribbons at the fair. They are made with cloth with felt numbers. sewn on a cloth square, with a safety pin on the back. These are then pinned onto the winning quilts.
You could use pink lemonade or pink punch and get a heart shaped rubber or glass mold and freeze some of the punch and let it float in the center of the punch bowl, I know this is to be a tea, but that would be something different instead of tea, or make hot spiced tea and use some pink lemonade to freeze and let it float.