The server I usually use to connect to #marp on EFnet ie. the London Uk one has been down for a few weeks now and none of the others in the list will connect me either. Maybe they're down for the summer I don't know.
<p>
I vote that this is a good time to move from EFnet .
After you posted this, I made an entry on the #marp web page about
switching servers. I forget if you have an account there or not, just
email me if you don't.