Paryushan is one of the most important holy event celebrated by both Digambar and Svetambar jains at different time intervals between August and September. It lasts for 8-10 days. People these days become more spiritual and dedicated towards their religion.
There is no hard and fast rule, instead people are free to follow the practices according to their desires.
This holy event goes parallel with Ganesh Chaturthi for Digambaras. Here people sacrifice thinks like the outside food, potato, onion in general while the sacrifices of many others are way too harder which include just one time meal or no meal at all for 10 days.
The main motive is to live a simple life.
The last day of the festival is called Michhami Dukhadam by Svetambaras and Uttam Kshama by Digambaras.
It's the day of asking forgiveness for any sin committed knowingly or unknowingly. Jains all over the world celebrate this festival enthusiastically and whole heartedly.
The only reason behind sacrificing things are just to test the dedication of the people and their humanity by seeing their sacrifice for the most precious things in their life.
The Paryushan season is onn! So to all the jains out there - Keep calm and follow Paryushan Parva.