It seems pretty random. I've seen them happen one right after the other, and I've seen them take a few hours between events.
Just make sure that Hero zone event channel is in a tab you can see.
Global @StarGeek
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Note that the Hellion Fire event in Steel Canyon, and the Troll Rave in Skyway, are disabled during the Winter Event (it was mentioned that they caused conflicts with the Winter Lord spawning).
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"Chew Electric Death, Snarling Cur!"
You know, your post reminded me that last year the fires and trolls seemed to be on hold during the winter event.
Here's the thread.
If you're unwilling to wait a few more days for the event to end, you might try the suggestion in the last post in that thread and work to clear any Winter Lord that might be in the zone, either through a team or simply by pulling it to a drone or Wentworth's kill zone.
Global @StarGeek
ParagonWiki.com-The original is still the best!
My Hero Merit rolls
Accuracy needed for 95% ToHit spreadsheet
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How many days does it take for the Hellion Arson event to re-trigger in Steel Canyon?
Proud member of the Steel 70! | Global @Radmofet ; usually on Pinnacle, sometimes on Virtue.