Stuck at 97% and have been thinking/trying about other "Activities" that can accomplish this to no avail. The challenge just says "Activities" but seem to only progress via the single rare Public Event.
After the new season, has anyone had any success at progressing this via a different way?
Patrols, adventures, lost sector, strikes, and even the new activity (that is on Mercury?) all do not seem to progress this.
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I did Lost Sector twice, as well as two public events. One or two sets of Vance's bounties, some killing around the area (ok, a lot of killing). Opened a last remaining region chest on one of the islands. Y'know, did various stuff, didn't exactly followed what counted towards the progress. I looked once at 70%, second time it was only 3-4% short. It happened eventually.