How much English is spoken at Japan Expo (Paris)
Been numerous times to this convention (as a pro and as a visitor).

Most of the publisher booths are from French publishers. Panels, activities are in French and speakers are in French. Some panels don't really require to understand French though (cosplay).

Some video projections are in English but it is rare.

Most of the booths will speak English, but it will mostly be approximate English.

Documentations (map and planning) and information booths are available in English.

The professional part (license market) is in English, but I don't think you will attend as a pro.