After nearly two pages I feel I must spring to the defence of pupils, teachers and parents. I'm not saying I disagree with all the comments about cost and extravagance, but proms are what they are and they are here to stay for this generation.
The Year 11s have worked so hard over the past 2 years that they deserve a reward for their efforts. (GCSEs are in some respects harder than in the "old days" and cause a lot of stress.) Many pupils have looked forward to the prom for months, some have done Saturday jobs and some have actually organised events to pay for their finery.
On the whole teachers are supportive too, because it gives us the opportunity to interact with the children out of the classroom. It's important the pupils see us as being human and friendly, and ready to take part in their one night of fun.
Parents can be instrumental too without it costing them a fortune. The PTA usually pays for the premises, the band, the food and drink ( no alcohol), the flowers, the photographer, extra staff etc. etc.
It's up to the individual how much he or she wants to spend on the dress/suit and trimmings. On average each pupil probably spends around £150. No more than the average GN might spend on a wedding outfit, shoes, hat, hair do, transport etc.
It's a once in a lifetime event. I hope everyone has a ball!