Ok, my 2p worth, there are a good few layouts out there, most won't feature on here as the most active tram modelling online resources are on FB.
Personally whilst I built a reasonably successful tram layout , I don't consider my myself as purely a tram modeller.... hence my presence here.
Regarding the Festival of model tramways, that is a whole different game. The festival was a privately run show, it wasn't a TLRS show, I became somewhat disenchanted at exhibiting there after doing quite a few....no expenses were paid and to a London show would cost me at least 2-300 quid all in...and that's not even taking time off as a self employed person into account....On my last visit to a 'London' festival having carted one of the bigger displays the longest distance I was pointed to the NCP car park round the back after unloading whilst some more local exhibitors managed to park for free.....yeah I wasn't happy.
Festival (north) to a degree had already been usurped by a show at Rigby Rd Blackpool and Covid 19 notwithstanding will most likely continue....However I doubt there will be a 'national' show again as who will organise it? The TLRS are nominally the tram modelling society but they won't unless there are changes, and a number of more active exhibitors are no longer members.
Sorry for the long boring answers....as to are tram layouts in demand for exhibition (or were pre this year) yes definitely, I already have a good few invites for Grime Sts successor on the 'when you're ready' basis.....motivation is the issue!