The Ban Magic Festival's outing, on one hand, is a tradition derived from customs; on the other hand, it's also the modern magic community's transformation of traditional magic in a certain sense, embodying the wizards' pursuit of wonderful aspirations.
In Xiao Xiao's words, it's about changing the scenery, changing the mood.
All this originates from traditional wizards' preference to hide themselves.
For instance, names must be concealed, with aliases rampant everywhere; addresses must be hidden, not to be known by others; spells must be guarded closely, as they are the foundation of settling down and making a home; recipes also must be kept secret, after all, teaching an apprentice could starve the master. And so on.