Sending it, and what to watch afterwards
The invitation is only worth sending once the page can keep the record. Publish it, then paste the address where your audience already reads your messages: an email, a chat, a slide at the end of a talk, a QR on a printed notice. One page carries one date, so a repeat evening is a second invitation with its own link and its own list.
Afterwards the list tells you more than the headline number. Page views sit beside the count of who registered, and people land as registered, attended, waitlisted, cancelled or a no-show, all of which comes out as CSV or PDF when somebody asks for the sheet. Emails at twenty-four hours, one hour and fifteen minutes go out on their own unless you switch them off. Nobody reconciles a second spreadsheet at midnight, which is the entire reason to make the invitation on the page rather than beside it.