Coworker Over Indulges at Industry Events

I have a dilemma and am hoping to get some advice on how to handle the situation. Many of the folks within the company travel quite a bit, and host or attend many industry events throughout the year. One of the folks who attends these events, seems to always over indulge. Seems now the indulgence is being noticed by outside constituents, who are letting me know what they observed. The person is in a position that would not receive any conversation willingly. How does this person recognize the issue? How do I let this person know there is an issue without consequences?

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