Police were called to Harbert Road, Edmonton, near Box H9 Nightclub to a huge fight involving 15 to 30 men at 4.34am on Sunday.
Six men, in their late teens and early 20s, were stabbed but none are in a serious condition.
It is unknown whether those involved attended the music event.
Detective Inspector Chris Rixon, from Enfield CID, said: “This was a large scale fight which would have been seen by people who were at the busy nightclub and in the area. Luckily no one was critically injured in the attack.
“We would appeal to anyone with any information or any witnesses to come forward and speak to police or to Crimestoppers anonymously.”
Anyone with information can call Enfield CID on 0208 345 3315.
Information can also be given anonymously by calling 0800 555 111 or by visiting crimestoppers-uk.org