948. By 2016, muggleborns are no longer just thrown into the wizarding world to fend for themselves. Instead, Hogwarts introduces a mandatory Wizarding Culture class, during the summers before and throughout 1st and 2nd year, where muggleborns are taught wizarding manners, etiquette, culture, religions, government, etc so that they’re not lost and fending for themselves in a whole new culture after their 7th year.