I vaguely remember over the years occasionally hearing such letters read from the platform. I usually tune that kind of begging out.
I think here in the UK it was related to 1) accommodation for visiting JWs involved in the Britain Bethel relocation from London to Chelmsford a few years back, and 2) more recently, something to do with putting up visiting JWs for the preaching campaign in the London area which is coming up soon.
Although I don't remember such letters in detail, I do recall thinking it's a bit crazy expecting JWs living in an expensive city like London where property is massively over-priced (and often too small for people to afford spare rooms and extra space) to just throw open their doors and welcome others to stay with them for what could be several weeks. Yeah, right. "Good luck" with that!