Most of what I deem essential has been said.
Though I'd throw in Ted Nugent's" Intensities in 10 Cities" LP myself, but maybe that is more a fan fave, than essential ?
listening to Michael Schenker Group - Rock Will Never Die (1984) right now.
Ever since I heard of "live" albums, like one of my faves which also was on vhs/dvd-
THE KINKS-One For The Road (dbl-lp),
at the same time got started being interested in "bootleg" tapes/Lp's
and now with the internet, it is better than ever.
Plus with YouTube there are those sharing concerts I can never afford to attend.
I have almost all of the Led Zeppelin 1970s boots that have been shared online, which is great as I was only aware of The Monkess and Bay City Rollers and The Partridge Family back then in my childhood.
PS. Glad an ULTIMATUM dvd was finally released!
My pet peeve of this new generation is they do not record/film/share concerts, especially if they are not upfront and headbanging.
I try to record everything and let a band or promoter know in case they have requests to get a copy.