Sanskar
Vidyarambha
The first letters, written before the goddess of learning.
When
When the child is ready for letters, often around the fifth year.
At vidyarambha the child writes the first letters with an elder's hand over theirs — in a plate of rice, or on a slate. Most houses begin with Om or Shri. Learning is treated as a rite, not only as an admission.
The school date and this ceremony need not be the same day. Keep both. Let study begin with a blessing, not with fear.
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.