Just heard that a Catholic priest offered Mass to a huge congregation of young people at 6am this morning.
Offered or accepted AB - and define a 'huge congregation' - or do you just mean the 200,000 people who were at Glastonbury, all of whom presumably would have been 'offered' this service, although I suspect the vast, vast majority would not have chosen to take up the offer.
AB - about 1% of the population are regular catholic mass attenders, so that would be about 2000 of the 200,000 people at Glastonbury (presuming they are demographically representative of the mass attending population - they won't be by the way). So presumably some of those 2000 may have chosen also to attend mass while at Glastonbury as it was on offer.