How it behaves on the day
Guests open the invitation link once from the WhatsApp message, then return to it in the car, on the train, or outside the wrong gate. Because the page is live, a correction you make that same morning, a changed gate or a new parking arrangement, is what the next guest reads. Nobody is working from a screenshot of an older plan.
The phone calls do not vanish entirely; some guests will always ring. But the call becomes “I can see the directions, is the side gate open?” instead of “where exactly are we?” shouted over a poor signal. That is a conversation you can finish in fifteen seconds and then forget.