Kartik Shukla Trayodashi, Vaikuntha Chaturdashi

Kartik Shukla Trayodashi
According to Narada Purana,

ऊर्ज्शुक्लत्रयोदश्यामेकभोजी द्विजोत्तम । पुनः स्नात्वा प्रदोषे तु वाग्यतः सुसमाहितः ।। १२२-४८ ।।
प्रदीपानां सहस्रेण शतेनाप्यथवा द्विज । प्रदीपयेच्छिवं वापि द्वात्रिंशद्दीपमालया ।। १२२-४९ ।।
घृतेन दीपयेद्द्वीपान्गंधाद्यैः पूजयेच्छिवम् । फलैर्नानाविधैश्चैव नैवेद्यैरपि नारद ।। १२२-५० ।।
ततः स्तुवीत देवेशं शिवं नाम्नां शतेन च । तानि नामानि कीर्त्यंते सर्वाभीष्टप्रदानि वै ।। १२२-५१ ।।

On the day of Kartik Shukla Trayodashi, one should observe a fast after having one meal. After bathing again during Pradosh Kaal, be silent and concentrated, light Lord Shiva with a row of thirty-two lamps. Light the lamps with Cow Ghee and worship Lord Shiva with smell etc. Then satisfy them with various types of fruits and naivedyas. By fasting in this way, a person enjoys all the pleasures of this world with the prasad of Mahadevji and finally attains the abode of Shivdham.

Kartik Month
सीदलपुष्पाणि​ ​ये यच्छन्ति जनार्दने।​
​कार्तिके सकलं वत्स​ ​पापं जन्मार्जितं दहेत्।।​ (पद्मपुराण)
Bramhaji says to Naradji – Vatsa! Those who offer Tulsi leaves and flowers to Lord Janardan in Kartika, all their sins committed throughout their birth are burnt to ashes.

Increase happiness and prosperity on the day of Vaikuntha Chaturdashi.
On 17th November 2021, Wednesday (Vaikuntha Chaturdashi fasting) is on 18th November, Thursday is Vaikunth (Chaturdashi worship).

According to Devi Purana, on this day, bread made of barley flour is offered to Mother Parvati and that bread is eaten in the prasad. Those who eat barley bread in prasad by offering bhog to Mother Parvati, happiness and wealth will increase in their house, it is written in Devi Purana.

On the day of Vaikuntha Chaturdashi, making barley bread in their respective homes, while offering it to Mother Parvati, said these mantras –
Om Parvityai Namah:
Om Gurya damp:
Om Umayyay Namah:
Om Shankarpriyai Namah:
Om Ambikayi Namah:

After worshiping Mother Parvati with these mantras, offer barley bread to her, then eat all the bread in the house. Those who eat barley porridge, bread made of barley flour, as long as they live, their kidney will be fine, the kidney will never be bad. If there is swelling anywhere in the body, there is swelling in the kidneys, swelling in the liver, swelling in the intestines, then eat barley bread, it cures all the problems.