In Jainism, Kalyanak refers to auspicious events in the lives of Tirthankaras and other great souls. There are traditionally five main kalyanaks celebrated:

1. Chyavan (Conception) Kalyanak
2. Janma (Birth) Kalyanak
3. Diksha (Renunciation) Kalyanak
4. Kevaljnan (Omniscience) Kalyanak
5. Nirvan (Liberation) Kalyanak

Sarv Kalyanak Gatha is a prayer or hymn recited in honor of these auspicious events. There are many versions depending on the sect and region. Here is a common Jain Sarv Kalyanak Gatha in Sanskrit with its meaning:

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गाथा (Gatha):

सर्वे तीर्थंकर भगवन्तों, पंच कल्याणक के धनी। च्यवन, जन्म, दीक्षा, केवलज्ञान, मोक्ष सुख मनी॥ च्यवन कल्याणक में, मात-पिता सुखद लहे। जन्म कल्याणक में, इंद्रादिक पूजन करे॥ दीक्षा कल्याणक में, वैराग्य भाव प्रकटे। केवलज्ञान कल्याणक में, उपदेश अमृत वटे॥ मोक्ष कल्याणक में, संसार बंधन कटे। पंच कल्याणक में, सर्व सिद्धि की प्राप्ति होते॥

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Meaning (English Translation):

All Tirthankaras, the Lords, are blessed with five Kalyanaks: Conception, Birth, Renunciation, Omniscience, and Liberation. In Conception, the parents attain great joy, At Birth, Indra and other deities perform worship. At Renunciation, detachment arises, At Omniscience, nectar-like sermons are delivered. At Liberation, the bonds of the world are destroyed. Through the five Kalyanaks, all accomplishments are attained.

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Purpose: This gatha is sung or recited in Jain temples, during Panch Kalyanak Pratishtha, and on auspicious occasions to remember the virtues and events in the lives of Tirthankaras.

If you want a specific Sarv Kalyanak Gatha for a particular Tirthankara, please let me know!