Achal Batala, a few kilometres from Batala, is the site of a Shiva temple and a large fair, and the janamsakhi tradition places a debate there between Guru Nanak Dev Ji and the Nath jogis under Bhangar Nath at the Shivratri gathering.
The exchange recorded is about whether renunciation is the way, and the Guru's position is that it is not: that the householder's life, worked honestly, is the ground.
That argument, with the jogis, recurs throughout the janamsakhi accounts and in the Siddh Gosht in the Guru Granth Sahib Ji, and it is the point on which the Sikh tradition separated from the ascetic orders around it.
Gurdwara Achal Sahib stands at the site, beside the temple, and the Shivratri fair continues.
A Sikh gurdwara and a Shiva temple sharing a fairground, commemorating an argument between the two traditions that was conducted there, is a reasonable description of how religion in Punjab has actually worked.
The Naths held establishments across this country and Achal was one of their gathering points, which is why the debate is placed there rather than anywhere else. Their own institutions here have left almost nothing behind.
The fair is still held. It is a Shaivite occasion at a site that carries a Sikh association, which is the ordinary condition of religious sites in this part of Punjab.
A gurdwara and a temple stand there together. What was argued about at that fair has been continuously observed by both traditions for five centuries.