I wrote a script to make Anki spaced repetition flash card decks with avatars and names pulled from the meetup API. I would use GitHub Actions to run the script a few hours before the event, then drop the importable deck into a Google Drive folder. I'd review the deck before the meetup, and then at the event, I'd not stress about names. I'd pretend to introduce myself to new people like I didn't already know their names, but I'd be able to make them feel very welcome when I remembered, or introduced them to others.
Why do this arguably creepy thing? Because I am really forgetful with names, and when I forget, I become reluctant to approach people, which comes across as less friendly than I prefer to be. But I believe using people's names is REALLY important to community organizing. When I know names, I am really great at using them a lot, helping others learn them, generously making introductions, and helping people to feel a sense of belonging.
It was the best community organizer hack I ever came up with, until meetup locked down their API and broke it...!