They had attended the social function in Chal Nathal village of Kathua district yesterday.
Of them, 27 persons, including 14 women and four children, were later referred to Sub-district Hospital at Hiranagar, police said, adding a case has been registered in this incident and investigation has been initiated.
The people fell ill after eating contaminated food and are suffering from diarrhoea and vomiting, a doctor who attended the patients said.
Treatment is going on and their condition is stable, he added.