Actually, "Red haired guest" is the guy talking to the man in the checked suit.
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The "man-bun guy is not Sage's Dad" theory actually falls through when Sage describes her Dad exactly as what that guy is doing.
mc "Are you at least having fun here?"
sa "Um...no?"
sa "Everyone's so fucking fake and my dad even showed up tonight."
mc "Your dad's here?"
sa "Ugh... Yeah. That's why I'm not downstairs and have turned off my phone. I'm avoiding him."
sa "He's just here looking for new business opportunities and kissing asses. It makes me sick."