Mot said something a few months back, how the MASH finale was viewed by 100 million people. That will never happen again. There's a show called The Good Doctor that is pretty decent that I only found out about a few weeks ago. It's been on since 2017. What TV shows bring people together anymore in 2024? I have no idea.
I'd say the last days of event cable would have been around The Walking Dead, Breaking Bad, GOT era.
One of the things that kind of ruined the event model of old was that the shows just go on for too long, get crappy spinoffs no one asked for and most importantly they tend to nosedive in quality. GOT totally shit the bed, TWD went on far too long with no direction and has like 3 spinoffs that all suck.
House of Dragons started off really rough but turned around a couple episodes in, but the the lingering stink from GOT really kept a lot of people from even bothering with it. That's happened with a lot of shows, people don't want to invest a ton of time only to be disappointed, which is what happens 75% of the time. Hell it just happened again with True Detective.
Also there's no build up anymore with series since so many streaming services just dump an entire season for people to binge. That leads to nobody really digesting what they watch anymore, they're constantly just looking for the next thing to consume and immediately forget. The big season or series finale doesn't leave much of an impact when you binged an entire series in a single weekend like some sort of hypnotized zombie.
Plus theatrical movies have started to become events again with stuff like Barbie, Oppenheimer, Mario etc. Theaters were almost exclusively dominated by MCU, DC and SW for so long that streaming and cable kind of had to pick up the slack. Now it's switching back again since comic book and SW movies have burnt themselves out and there's room in theaters for other things.