Fondation de la Haute Horlogerie will promote fine watchmaking across events and digital platforms, a so-called "phygical" outreach programme.
Cartier will have its own platform and others are using a portal created by Watches & Wonders Geneva.
Bulgari had already withdrawn, and remaining LVMH maisons say they cannot preserve their brand image at a Baselworld shorn of its biggest brands.
Mark and Candy loved arriving with four generations of the Udell family to Baselworld. Now they want that to bring that excitement to Geneva.
One of the great strengths of Baselworld in its pomp was the opportunity for small and medium-sized brands to be seen alongside the giants.
No dates have yet been announced for Watches & Wonders Geneva in 2021, but research into the availability of hotel rooms suggests a start on April 15.