What the link does after the send
This is where the idea pays for itself. Once the address is out, three things keep working through it without you touching anything you already sent. Guests answer, so the list fills itself. You edit, so the corrected time reaches everyone who has the link. The page keeps the deadline next to the reply button, so the ask stays present even after the message scrolled away.
One caution about drafts. An event page that has not been published is not visible to guests, so a link copied too early shows them a locked door rather than your invitation. Publish, then copy, then send, and open the link yourself once from a phone to see exactly what arrives.