The appearance anniversary of Srila Vyasadeva, the compiler of the Vedic literature. This event really is directed towards Srila Vyasadeva, thus in some sampradayas they refer to Guru Purnima as Vyasa Purnima. Traditionally it is the day when the guru is worshipped. In the book Festivals, Fairs and Fasts of India (Shakti M Gupta. 1991. Clarion books. page 88-89.) It says: Guru Purnima "……is observed on the full moon day in the month of Ashadha in honour of the sage Vyasa, by keeping a fast, worshippig him for His blessings and to gain wisdom. Formerly on this day, gurus who were the traditional teachers, were honoured by their pupils.
First month: No leafy vegetables, such as spinach, salads of all types, cabbages of all types, kale, leafy herbs like coriander, mint, parsley, curry and powdered leafy herbs and teas. Caturmasya stands for ‘four months’. It is the period between sayana and uttana ekadasis. The scriptures refer to this period as the duration of Lord Visnu’s sleep in this universe. The main goal of observing Caturmasya is to decrease attachment to material things and to increase devotion to Krishna.