Organisers of Bloc Weekend, which the 'Gin & Juice' rapper was headlining, shut down the festival due to fears for crowd safety.
According to WENN, police advised festival bosses that the venue in London's Docklands was too close to being overcrowded.
Festival-goers have revealed on Twitter that the event was dangerously full, leading to people at risk of being crushed while facing queuing for several hours to enter.
NME reporter Louis Pattinson, who attended the first night of Bloc Weekend, said: "The site was far too small for the numbers of punters who'd got in - all the tents were full with large queues outside, so festival-goers had nowhere to go but add to the queues. The security arrangements seemed inadequate and staff seemed overwhelmed."
In a statement on the festival website, organisers said: "By now everyone will have heard that Bloc 2012 was closed due to crowd safety concerns. We are all absolutely devastated that this happened, but the safety of everyone on site was paramount.
"Given the situation on the ground, we feel that it was the right decision to end the show early. Bloc will not open on Saturday 7th July so please don't come to the site. Stand by for full information on refunds."
Gary Numan and electronic band Orbital were also set to perform during the festival.
Snoop Dogg recently played a set at the 2012 Coachella Festival with a hologram of Tupac Shakur.