When I log in with my seasonal character, the seasonal events, world bosses, and infernal horde times are not displayed.
This is the Diablo Immortal forum :). Need to pick the 3/4 one for your issue.
Diablo Immortal does not have these.
That leaves us with…
A Google search for diablo iv forums gives this as the first returned link…
And a quick search of those found over 50 threads about “infernal hordes”
https://us.forums.blizzard.com/en/d4/search?q=infernal%20horde%20order%3Alatest