Heard about something? Take a picture of the flyer, pick ones you already took (screenshots work too, several at once for one event), or paste a link. We'll read it and fill in the details; you only check them.
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Instagram pages need a login we don't have: a screenshot of them works.
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In Facebook, on the event: ··· › Export event › Add to calendar. That saves a small calendar file with the name, time, place and description; pick it here and the form is filled in exactly. (Any calendar's .ics file works.)
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At the end of a jam, when people announce what's coming up: set the phone down in the circle and press record. We write down what was said, pick out the events, and you check each one.