Tell her you need to go get the glove.
Go sit on the bleachers for a while after you CAN"T find the glove.
Do the knee thing.
Say what you already thought of.
If the park is empty....
have some glasses and chilled wine/champagne, strawberries and some chocolate in the car trunk in a cooler. (Chocolate dipped strawberries can get soggy, put some Hershey's syrup in a tupperware container to dip strawberries in)
If park is not empty....have them back at home.