Spectators may normally enter the O2 universum 1 hour before the event. This may be changed based upon an agreement between the event promoter and the O2 universum Operator.

Spectators enter the O2 universum by the main entrance located on the 2nd floor accessible from Ceskomoravska St. or from the tram stop at Ceskomoravska St. This entrance in the O2 universum features 12 turnstiles and 2 gates for people with disabilities.