If you bothered to read the French invitation, yuou'd see it was not 'occult', it was 'Surrealist'. And, in fact, the costumes and masks are inspired by famous Surrealist paintings of the 20th century (such as the apple blocking the face painting by Magritte).
And the frauds Frank (d. 1791)and Zevi (d. 1676) attracted only a few thousand followers each, and were roundly denounced by the rabbinate and the majority of Orthodox.
Everything about that ball invitation is occultic in meaning. In the occult symbols have more meaning than words. Symbols are used to communicate to others "in the know".
Did you see the model of the dead and dismembered baby? That is not surrealism. That is the true heritage of the vampires who run everything into the ground.