I've found the answer to whether Sheffield was sold out. It appears not.
"300 ticket holders had been refunded for the event which was due to take place in the 2,373-capacity Oval Hall, the council said."
https://www.bbc.co.uk/news/uk-england-south-yorkshire-58463658
Still, I suspect all 24,000 people who signed the petition will be moving heaven and earth to get a ticket for the other, as yet uncancelled, dates, so Royston Vasey should be laughing all the way to the shop.
He's your wife, now. Good luck.
https://www.youtube.com/watch?v=OIrTTv_Isho