It looks like the virtual fleadh will be on StageIt.
Tickets available now and will remain on sale until the fleadh starts:
https://www.stageit.com/wild_atlantic_fleadh/st_patrick_s_week_march_13_march_17_from_7_pm_et/91978$75 USD (750 "notes")
March 13-17 @ 7 PM EST
~2 hrs each night
Because it's on StageIt, it seems like it will be one of those shows you have to watch as it happens (can't go back and watch it afterwards if you're not able to see it live).
I asked if the performances would be pre-recorded live too. I have seen pre-recorded shows on StageIt before and I think it's very likely they'll do that.
I'll be getting a ticket for this at some point. Even if a live tour somehow goes ahead that early next year, I think there's almost no chance the Canada/US border will be open by then (probably not until summer). But the good thing about all these online shows (and particularly the fleadh where you get to enjoy tons of acts for a single ticket) is that there's no cost or stress involved in travelling and you just get to enjoy lots of performances you wouldn't otherwise be seeing.