Full moon day during Ashadha month is known as Vyasa Puja day. Traditionally this day is reserved for Guru Puja or Guru Worship. On this day disciples offer Puja or pay respect to their Gurus. Guru refers to spiritual guide who enlighten disciples by his knowledge and teachings.
Vyasa Puja is also known as Vyasa Purnima and this day is commemorated as birth anniversary of Veda Vyasa. Veda Vyasa was the author as well as a character in the Hindu epic Mahabharata.