I think Deirdre is pretty good about posting her concerts on her socials & her website. I think you probably already know she has more than one FB account too.
If I had to read your mind, I'm guessing you don't want to wait til everyone knows because all the good seats will be taken by then? (I'm kind of doing that with Trinity & Mairead C for a March '24 concert.)
That being said, I think Deirdre coming to the US is a longshot, like you said. But there is always a chance!!!