Shukla Paksha Panchami during Sawan month is observed as Nag Panchami. Usually Nag Panchami day falls two days after Hariyali Teej <www.drikpanchang.com/festivals/teej/hariyali-teej-date-time.html?year=2019>. Currently Nag Panchami falls in month of July and August in English calendar. Women worship Nag Devta and offer milk to snakes on this day. Women also pray for the wellness of their brothers and family.
Read more here: www.drikpanchang.com/festivals/nag-panchami/nag-panchami-date-time.html?year=2019