We have had two events where we've run the server for a weekend, however the server was quite empty on the second event after the initial launch, so I'm not sure it would really be sustainable.
Saying that though, I did start making some changes to the server so we could potentially run it as a permanent-ish server, however I never finished it. We were thinking about running it on ClassicCube, although it seems there are very few players who actually play classic (at the time I'm writing this there are 7 people on classic servers in total) so it probably wouldn't be sustainable to do that.
Considering the noticeable drop in players between the first and second time the event was run, I wonder if there would be enough interest to run it again and try it out? A poll would probably be best I think, but if there's enough interest I see no reason whatsoever that we can't run the server as an event again at some point soon.