Please refer the Sec. 151 which reds as
"Knowingly joining or continuing in assembly of five or more persons after it has been commanded to disperse.—Whoever knowingly joins or continues in any assembly of five or more persons likely to cause a disturbance of the public peace, after such assembly has been lawfully commanded to disperse, shall be punished with imprisonment of either descripttion for a term which may extend to six months, or with fine, or with both".
Hence, the perosns involved in the fight could be booked guilty, if proven.
Adv. Rohit Dalmia