Feast or Famine with Dynamic Events.
I seem to notice that events occur more often if there are more people. Which would explain what you are experiencing.
The 1-15 people stay for the Svanir Shaman boss chest. And in Sparkfly, people stay for Tequila.
I do sparkfly every day for my dailies, run outer ring for the 15 types and then the headlands camp for the 5 events and 20 harvests. I’ve got it down to a 30min window for my dailies and then im off to other zones nice and quick. Also has the added bonus of having lots of verdant herb patches to give vanilla and a big, fat solo’able dragon who gives high lvl yellows if you have the RNG magic luck. You just have to find a place that you like and set up a route. There are 4 events round the middle camp and by the time you finish them one will already be resetting.