Dennis was the guest of honour at the Sports Industry Awards on Thursday night, where he received a lifetime achievement award.
Hamilton had indicated that he would attend but pulled out on Wednesday morning. It is understood that it was a personal decision by Hamilton rather than one made by the team.
No other members of the current McLaren team were present, though former world champions Alain Prost and Mika Hakkinen did attend.
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It is the second time in a week that Hamilton has appeared to snub his mentor, having failed to attend a party hosted by the Crown Prince of Bahrain on Sunday at which Dennis was present.
Hamilton later claimed that the team had instructed him to give the misleading evidence, and Dennis stood down as McLaren team principal last month.
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