Two female companions of men accused of shooting rivals outside a Melbourne boxing event have told a court they remember little of the night because they were drunk and "Xanied" and "Valied" on prescription drugs.

About a dozen people have refused to give statements to police over the shootings at the Kensington fight night on March 1 last year. The boxing event was organised by underworld figure Mick Gatto.

They have been ordered to attend special hearings at Melbourne Magistrates Court to answer questions about the night.

Two women - Brittany McGuire, the daughter of Tony Mokbel's ex-partner Danielle McGuire, and best friend Shanae Pericic - were in the witness box on Tuesday afternoon.