We used Hubspot Landing Pages with an embedded form to register people for Zoom webinars. I had thought there was no way of adding the event to someone's calendar... Am I wrong? Is it possible to either:
a) Allow them to download a calendar link like on the hubspot event above or
b) To automatically send them a calendar invite placeholder from my diary
FYI: I don't think the invite has to contain the Zoom link, it just needs to lock the time in their calendar.
I've found this thread with solutions that could be helpful for you. There are also these steps available to insert calendar invites in marketing emails.