If I did go, I would feel obliged to self-isolate for at least a week afterwards in case I'd picked up the Covid-19 virus. I have a couple of elderly friends and though M at 97 is very philosophical about coming to the end of her life, I really do not want to be the person that gives her a potentially fatal illness.
In fact the convention may not even go ahead. Events are being cancelled, such as the London Book Fair that should have been this weekend, but rather than dither and fret and worry, I've made the decision not to go and I feel happier having done it. We do have two trips away booked over the next few months, but we've booked a cottage or apartment, so contact with other people will be minimised and no more than normal. I have no intention of becoming a hermit, but I do like to weigh up the risks and I just feel that a crowded hotel would be pushing my luck.