The only information I have to go by regarding Bix's whereabouts at that time is from 'Man & Legend'. . .
Jan. 21 (Mon) - Cleveland Press, reviewing Whiteman's opening night, notes that "one of his best musicians is absent." The reference is to Bix, who SOMETIME DURING THIS WEEK SUFFERS A VIOLENT MENTAL AND PHYSICAL BREAKDOWN IN HIS ROOM AT THE CLEVELAND HOTEL. (My Capitals).
If this report is accurate then the dates can still tally with Brad's discovered coincidences during that same week.