There is a real dinner invitation behind this shape
Dinner invitations are one of the formats My Joyfullday builds rather than something you assemble yourself: the menu, the replies and the notes sit together on one page from the start, and the shareable link behaves like any other invitation here. To see the finished thing, look at /features/dinner-invites; to describe your dinner instead of configuring it, send a sentence to Jitabi on WhatsApp.
The general platform shape is unchanged whichever route you take. Details live in one place, guests reply on the page, the list keeps the count, and a change to the menu reaches everyone who opens the link afterwards. For eight at home that is a convenience. For a longer table with a hired cook, it is the difference between planning and hoping.