Completion of heroic public events does not give progress to Eventful Moment bounty.
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From this week [url=https://www.bungie.net/ru/Explore/Detail/News/49853]TWAB[/url]: [quote]The Warsat Heroic Public Event in the Mothyards of the Cosmodrome doesn’t count completions for objectives. [/quote] As I remember it was counted towards weekly Cosmodrome bounty, but not for Eventful Moments.