If there are a number of smaller children at the picnic, you can get them involved. Add 7-10 pounds of ice, attach the CO2 & let them roll the keg around until it is carbonated.
I like my rootbeer strong and with less sugar.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk