Police made three arrests before 1.30pm – with all three suspected to have planned to attend.
Officers were speaking to everyone in the area to check they have a valid reason for being in the city centre.
Archiv: Birmingham
Multiple people injured in series of stabbings in England
Cara Curran, a club promoter, said she saw multiple people fighting in the street.
„It was one group of boys against another group of boys,“ she told the BBC, adding that „racial slurs“ were being thrown.
Foreign Secretary Dominic Raab said it was „a very serious incident. Our thoughts and prayers are with the victims and their families.“
Birmingham stabbings: Manhunt as one killed and seven hurt
A man who killed one man and wounded seven others during a two-hour stabbing rampage across Birmingham city centre remains at large, police said.
The first stabbing was in Constitution Hill at 00:30 BST and the killer moved south, apparently attacking at random, officers said.