I agree with BluesBrother and slim. The whole Twickenham stadium of around 25,000+ singing some of the old "kingdom songs" was very moving back in the day. Meeting old friends again and making new ones was fun. Some of the speakers could be very motivating. New book and brochure releases were eagerly anticipated. And after the Sunday afternoon ended, as I was young, single and carefree back then (ahem) there was usually a group going to a local restaurant or a pub for a meal and 'association' to look forward to.
However, I always hated the dramas with a passion, yet most of the others in attendance would consider them a 'highlight' and rave about them. A group of barely-visible JWs way off in the middle of the pitch with some tacky costumes and a cheap set, miming to a corny and trite dialogue in thick American accents? No thanks!
Fortunately, the drama was usually just before lunch, so I'd use that time to take my own break and go to the supermarket cafe over the road, or if I was working as an attendant, volunteer for a shift somewhere in the stadium where I couldn't hear that rubbish!
Apart from that, and the occasional terrible weather, conventions weren't too bad to me until about 10-15 years ago.