Norton/ Steve has been opening his Mudcat Song Circle room on Sundays, starting about 1pm EST. It seems to go on till about 8 or 8pm EST.I'm not sure what the situation is with the Snug now. It did open on a Thursday night for the UK (maybe it did last night but I didn't notice). As a rough guide, I'd guess in EST we would be talking 4pm to 8pm.
Even if there is no "Mudcat" room open, there are often Mudcatters to be found in Paltalk - just look for the live rooms. dwditty, Margaret V, IvanB, Norton, Frank(toledo), Jacko (scalliwag) and me (squiggle) are amongst the more regular visitors.
Jon