It depends on the bass and the gig, but I tend to leave the EQ mostly flat more often than not.
For my trusty old Carvin LB70, I rarely use the EQ other than occasionally to very slightly boost the bass, as this bass is very strong in the highs and upper mids, although at gig volume I don't generally find any extra bass necessary.
For my Zon VB-4, I don't usually use the EQ much if I am playing it by itself, but if I am bringing it to the same gig or rehearsal as the Carvin I might boost the hi-mids or slightly cut the bass so that the two basses are closer in tone and work better with the same amp settings.
For my trusty old Carvin LB70, I rarely use the EQ other than occasionally to very slightly boost the bass, as this bass is very strong in the highs and upper mids, although at gig volume I don't generally find any extra bass necessary.
For my Zon VB-4, I don't usually use the EQ much if I am playing it by itself, but if I am bringing it to the same gig or rehearsal as the Carvin I might boost the hi-mids or slightly cut the bass so that the two basses are closer in tone and work better with the same amp settings.