I'm a Glastonbury virgin. What should I do there?

I’ve managed to go 30 years without going to Glastonbury, but in 2015 I’m finally taking the plunge. Suggest your essential rites of passage at the festival, and I’ll tick them off – within reasonThanks to a combination of being a cheapskate, a fairweather camper and generally feckless, I’ve managed to reach the age of 30 without ever going to Glastonbury. Coachella: yes. Benicassim: yes. Various events in Butlin’s holiday camps wandering around the amusement arcades in a fugue state