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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The lost sector and heroic adventures. Pretty sure patrols don't count(unless they changed this) and the sundial doesn't count.