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The Ninth Adhyaya of Devi Bhagavatam vividly describes Devi Shashthi (also called Chhathi Maiya)

First the author herself cleverly admits, Navratri and Durga Puja happen around same time and the focus is on same divinity Durga Maa.

This festival is recorded in documents pertaining to British rule. For eg. Travellers’ Companion by Abdul Rashid published in 1907 mentions about the fair held on this festival which was the largest and most important fair of (Ambala) district, attended by 20,000-25,000 devotees.
रामानन्द मोहि गुरु मिल्यो, पायो ब्रह्मविसास। https://twitter.com/pancha_nada/status/1761288813098242408
The inscription was discovered in 1880 by Sir Robert Egerton, the British Lt. Gov. of that time from the inner vault of Haji Ratan tomb near the Bathinda fort. Later this inscription was examined by Archeological Survey of India and report was prepared by Mr. Garrick and DR Sahni 
Karwā Chauth Vrat is mentioned as Karaka Chaturthi (करक चतुर्थी) in our Hindu Granths.
Every year around 5000 boys would dress as Hanumanji for around 10 days till #Dussehra