Paris hosts 11 recurring business events listed on Wikidata: 9 trade fairs, 1 congress and 1 exhibition. Dated ones include Paris Games Week (October). Paris Expo Porte de Versailles hosts 4 of them.
Recurring conferences, trade fairs, expos and conventions in Paris, from Wikidata. Typical months only: check the organiser for this year's dates before you book.
Paris Games Week
Trade fair · Typically October · Paris Expo Porte de Versailles (convention / exhibition centre)