add models class and fields through python script

i am working on a data base of college students. it follows the same schema but has different tables for students of different years. further each student participates in some events which are randomly announced during the year. i want to maintain this data. i want a  way such that admin of the site can make new student model each year and add new event fields to the model through forms and not mess with my code. please if possible tell the detailed process i am a beginner in django

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