On the schedule can be replaced with many synonyms that convey the same meaning. Some examples include "timetabled," "planned," "scheduled," "arranged," and "programmed." These synonyms are often used interchangeably to indicate that something has been added to a schedule or agenda and will take place at a specific time. Similarly, "on the calendar," "on the agenda," and "on the itinerary" are other expressions that can be used instead of on the schedule to indicate that something has been planned or organized in advance. Using different synonyms for on the schedule can add variety and interest to your language and improve your communication skills.