The answer is meeting.
''Philadelphia Convention'' my friend
meeting
A 7-letter word that can be another name for a convention is "meeting." It refers to a gathering of people for discussion or decision-making on specific topics.
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The letter x.
The Grand Convention was another name for the Constitutional Convention, also referred to by many as the Philadelphia Convention. It took place in Philadelphia starting May 25, 1787 and ended on September 17, 1787.
reinvetion
A convention could mean a conference, or something that is a custom.
Reynard
National Convention of Gospel Choirs and Choruses