[heronymus]

Not a native speaker, I don't understand the meaning of "filled up urns for meeting rooms"?

[ghaff]

The big coffee containers with taps (e.g. https://www.walmart.com/ip/Hamilton-Beach-42-Cup-Coffee-Urn-...) that get set out by hotels and other event spaces for people to pour themselves coffee.

They tend to sit out over a heat source and, if the coffee wasn't lousy to begin with, it is after it's been burning over a flame or other heat source for an hour or two.

[simonebrunozzi]

heronymus, if it is still not clear, the "urn" is the large coffee pot.

(not a native English speaker myself, and I tried my best to interpret your difficulty).

[seibelj]

The big coffee buckets used for big meetings and conferences. Usually the coffee is bad in them.