TY JOUR TI One Theme of the Project Is a Lot of Ideas: on the Example of Designing a Mathematical Calendar KW mathematical calendar KW educational project KW extracurricular activities in mathematics KW substantive content of the project KW Eventseminar KW product of the project KW methodological and mathematical competence of students JO Profession-Oriented School AU Pavlova, O.A. AU Chirkova, N.I. PY 2019 IS 7 PB INFRA-M Academic Publishing LLC.