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In calendly you can pass custom input data in the url so that it is prefilled upon user opening: <https://help.calendly.com/hc/en-us/articles/226766767-Pre-populate-invitee-information-on-the-scheduling-page#pre-populate-invitee-information-on-the-scheduling-page-0-0|prepopulate custom inputs in calendly.>

TL;DR - you can add `?a1=prefilled-stuff-here?a2=prefilled-2nd-answer` to calendly to prepopulate custom inputs - can you do this in <http://cal.com|cal.com>?

yes you can! here is a video <https://www.youtube.com/watch?v=5MybtA2rdBU>

More info on that: <https://github.com/calcom/cal.com/blob/main/apps/docs/pages/developer/pre-fill.mdx>