The chair of the all-party parliamentary group for runaway and missing children and adults, Ann Coffey, explained the group's inquiry found scores of children go missing from care each year and the authorities don't know where they are.
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Mark Acklom, who wanted over an alleged £850k romance scam, is believed to be with his wife and two daughters.
The denial came after a German paper reported that Theresa May was also said to have appeared "despondent and discouraged" at the dinner.
Jamie Harron was arrested in July over an incident in which he said he put his hand on a man's hip to avoid spilling a drink in a bar.