A hackathon-heavy stretch in Paris, with the one big summit arriving in early December. Adopt AI (Dec 3, Grand Palais) packs 2,000+ CEOs into one room, which makes it useful if you sell to enterprise. For builders, the European Defense Tech Hackathon (Nov 20) and AI Tinkerers Paris's Physical AI Builders Day (Dec 2) are the picks. VivaTech (Jun 16) and RAISE Summit (Jul 6) are still months out.