The devotees had consumed 'khichdi' as prasad at the 'Pir Mela' and started complaining of stomach ache and vomiting, Arambagh Municipality Chairman Swapan Nandy said.
He said the pulses used in the khichdi were suspected to be adulterated and sent for test.
The ailing persons are now out of danger, he said, adding they will be discharged soon.
A district health officer said a medical team has been sent to the area.