Indeed, but the organisers, not the rail industry, needs to organise it and hire it!
Not sure about that, is it really the job of event organisers to to arrange for RAILWAY rolling stock provision ?
Are organisers of events at the proposed Bristol arena expected to hire trains for events ?
Are the FA expected to hire trains for cup finals ?
Or the West country tourist trade to "organise and hire" trains for their customers.
IMHO▸ , it is up to "the railway" to provide within reason for the needs of their fare payers, this includes both regular commuters and leisure travel including special events.
I know that the mantra is "there is no spare rolling stock, and we cant justify buying or leasing extra stock for once a year events"
Once a year events are in total numerous enough that extra rolling stock IS JUSTIFIED not for any one event, but in total.
Easter weekend, the pre Christmas and post Christmas rush, other bank holidays, airshows, cup finals, rugby internationals, boardmasters, Glastonbury, Reading festival, beginnings and ends of university terms, connecting with cruise ships, and other events, if considered in total DO justify a reserve of rolling stock.
Loco hauled, and of generous length Perhaps 2 first class and 8 standard class coaches as the standard MINIMUM formation, with a small number of luggage vans, catering vehicles, or extra seated coaches that may be added according to the nature of the event.