This feast marks the beginning of summer. As such, it replaces an ancient solstice pagan celebration. It is very fitting since John says "he must decrease while Christ must increase," and the days of summer sunlight are now indeed increasing. We also know from Scripture that John is 6 months older than Jesus, so naturally his birthday would be celebrated in June. (It's not on the 25 because of a Roman Calendar adjustment--I guess.?.)
The pagan celebrations that were then Christianized included bonfires. If you are blessed enough to have an area for bonfires and the weather isn't too hot--a summer bonfire with marshmallows is the a must for this night. Schedule it and do it! This is a wonderful summer tradition which your children will remember and cherish.