Hey there, I made a map of the pubic events on the four planets while waiting for public events to pop. I find this helps me to decide which event to go to on the larger planets since some events are harder to trigger the heroic mode without everyone knowing what to do. Hope this helps you as well.
I am not sure if this is all the public events as some I noticed a bit rare and don't pop up as often so let me know if I missed any.
* EDZ: [url]https://i.imgur.com/3b4cVTH.jpg[/url]
* Nessus: [url]https://i.imgur.com/0juIIrg.jpg[/url]
* Io: [url]https://i.imgur.com/jF1XqPB.jpg[/url]
* Titan: [url]https://i.imgur.com/8JQXf7p.jpg[/url]
For those who are unsure about how to activate heroic public events, I made a [url=http://dulfy.net/2017/09/13/destiny-2-heroic-public-events-guide/#Public_Events_and_Heroic_Activations]short guide[/url] to each event with pictures as well:
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THANKS GREAT LITTLE GUIDE FOR NOOBIES LIKE MYSELF.