Sanskar
Keshanta
The first shave, a threshold into youth.
When
Toward the end of student life, by family custom.
Keshanta, also called godaan, is the first shave, with a gift to the teacher. It marks the close of the years of study. Many communities use another name, and many houses fold it into samavartana.
The young person's assent, and a simple setting, suit the day. Expense does not enlarge a sanskar.
This is a general introduction. Sequence, materials, and timing change with family, region, and shakha. Your priest and your own custom have the last word.