I must say I'm not optimistic. The organisers wouldn't be able to avoid making a large loss unless absolutely everybody who would have attended pre-Covid is prepared to attend this October. Better still, if even more people than usual attended.
Of course the mass vaccine rollout helps, but I doubt the country will get back to normal any time this year, simply because the rest of the world won't, and we can't close our borders completely, unlike New Zealand (which is NOT a big international hub like the UK). So there will still be many people who don't feel comfortable mixing with others, and government-imposed social distancing and restrictions, especially indoors.
Since the Bash needs months of planning and organisation, I think we're on a loser here. I very much hope to be proved wrong, though.