It isn't possible the way it is now for new players (like my son) who just started playing to earn enough dust to get event items before the event is over with dust & I'm NOT RICH!!
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Then explain to him he cannot always get everything he wants. Read this article on Bright Dust [url=https://www.reddit.com/r/DestinyTheGame/comments/dcu93p/bright_dust_farming_in_shadowkeep/]Farming[/url]