well not wishing to disagree - but once again forced to. i think a lot of the music recommended is quite difficult technically. nothing wrong with that, but its a pain in the arse for the audience to see the singer struggling.

i would say in your situation study the albums uf the spinners. not all the repertoire is hackneyed, but it is all delivered with great spirit, skill and professionalism. and they forgot more about getting an audience joining in than the rest of us will ever know.

also - it will enable you to hang onto the uke, whose presence if you are used to it will give you confidence and keep you in key! the uke can be played plaintively or in a jolly way in several keys. and it also you can use a baritone uke for variety.

one of my favourites that they often played was The Bleacher lass of Kelvinhaugh.
as Jim said, best of luck! and have fun!