When it comes to setting a date for an event or appointment, there are a variety of synonyms for the phrase "affixed a date to". You could say that you "scheduled" a date, "arranged" a date, "set" a date, "fixed" a date, or "determined" a date. Other options include "designated", "established", "marked", "noted", "decided upon", and "selected". Each of these phrases conveys the idea that a date has been chosen and assigned to a specific event or activity. So the next time you need to express this concept, consider using any of these alternatives for a more varied and engaging vocabulary.