Bhupender Nagar, who was working at the hotel at Nehru Place, was chased, threatened with a firearm and assaulted near at New Friends Colony on February 13.
A senior police official said eight persons, including the main accused Rocky, were arrested.
"Nagar was attacked after he denied them entry to the club. To avenge the insult, they started following him as soon as he left club at 5 am on February 13," the official said.
Four men were caught on CCTV footage of the hotel, threatening Nagar by showing a firearm and beating his friends with iron rods.
The accused had allegedly created ruckus in the club two months ago and since then, their entry was banned.