What a forwarded poster cannot do
The flyer looks good and has no memory. Someone opens it on Thursday and asks what time โ you say seven. Three people later, the same question arrives, and the answer has moved because the plan has. The poster is still saying half past six, sitting in a dozen chat histories, quietly undermining you.
A digital birthday invitation is the same artwork with a spine. The details live on a page and are edited there, so the version opened today is the current one. And unlike an image, it listens: whoever is coming presses a button, and their name, plus-one, and food note arrive on the guest list instead of getting lost in the thread.