If you needed another reason to hop on our "TMZ After Dark" tour (and trust, we’ve got plenty) -- Justina Valentine gave the ultimate sales pitch by turning the weekend into a full-blown rager!

The 'Wild N Out' rapper totally owned the crowd ... freestyling wild about everyone on the party bus -- like a private concert on wheels.

Check out the full vid ... Justina even dropped a bar about Ray J , who made a special -- and shirtless -- guest appearance during this night out in Hollywood.

As you can see, it’s a nonstop vibe -- everyone’s chillin’, groovin’, and keeping the night alive. Wanna get in on it? Snag tickets for next weekend while they’re still up for grabs!

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