I don't know if it's gone for good, but it's been gone for weeks. Word from a Kalmbach staffer says it's a hassle for them too, a number of on-line features they use for their own research have gone missing.
They're supposed to update the system sometime next year, but when is the question.
If you're looking for upcoming train meets (and I might get in trouble for this) try the "Railfan and Railroad" website and check "Timetables." That's a list of upcoming train meets as well. Usually not as complete as the Kalmbach "Coming Events" list but it's better than nothing.