Say, Dai, the one and only, did you want serious answers? I just reread your post, and I'm sorry, I thought you were asking for more songs to do like the ones listed. I was thinking 45 minute set, not 20.
In general people start with something upbeat/fast that they know well, and end with a rouser. So, I don't know the Miners lifeguard or Father Mackie , but I'd suggest starting with Paddy Lay Back or Dido, Bendigo. And of course, close with Rolling Home.
Blessings,
Barbara
Let us know how it goes!