Chapter 114 (pg 28) of the Narada Purana Vol 4 gives an account on the vratas observed on Panchami tithis. It describes a ritual performed on the Shukla Panchami of Sravana.
27-29. This rite (in propitiation of serpents) is performed on the fifth day in the bright half of the month of Sravana, by men firm in
their belief in the Vedas.
On either side of the door-way, figures of poisonous serpents should be drawn in cowdung. He should worship them with scents, etc.
Thereafter he should worship Indrani with gold, silver, etc, curds,
raw rice-grains, water from Kusa grass, scents, fragrant flowers,
incense, lights and hoards of Naivedyas. After circumambulating and
bowing down, he should pray with great devotion. He should give the
articles of worship to leading Brāhmaņas.
30.“In all my births, may these gold, silver, etc. that have been given to Brahmanas be productive of endless benefit."
31.O Narada, he who gifts away along with this utterance, the articles with great devotion, will delight Kubera, the presiding deity of
wealth, who bestows affluence like gold, upon his devotees.
32.After observing the holy rite, the man should feed Brahmanas with devotion. Thereafter, he should partake of his food surrounded by his
wife, children and friends.
33-34a. The devotee should propitiate serpents with milk on the fifth day in the dark half of the month of Bhadrapada, (thereby) the
entire family upto the seventh generation shall be free from the fear
This book cites a translation of a passage from Skanda Purana Kasi Khanda
(I wasn't able locate the actual passage from the Purana, but this translation seems to provide the ritual in its entirety which is why I'm linking it here)
I proceed to a translation regarding this festival: it is from the
portion of the Skanda Purana, termed Kási Khanda, or the Section
relating to Kasi or Benares;
"The fifth lunar day of Srávana is held sacred to the Nagas; on that
day let ablutions be performed in the pool termed Vasuki, of sacred to
Vasuki the Lord of the Nagas: by observing this “ceremony the Nagas
are pleased, and the votaries may rest free from “ the dread of
People should collect together for the purpose of amusement and for
worship; the door posts should be smeared with cow dung, and figures
should be drawn of deadly poisonous Serpents, and offerings should be
made to the Nagas, of ghee, durva grass, kusa and flowers, also of
perfumes, garlands, and the like; by such observance, whole families
reside free from dread of Serpents.
The drawings of the Nagas should represent them armed with scymitars
and shields. The upper part of the body from the navel, should be that
of a human being, and the lower part that of a Serpent-hoods must be
extended over the heads, and entwined with any odd number of snakes;
all these must be of a deadly black hue, and painted either in the
open highway, or in the house. This fifth day of Sravana is a day of
festival among the Nagas, let their images therefore be bathed in