Mobile + Web DevCon is a comprehensive conference focusing on mobile application development, taking place in San Francisco, California. It covers a range of topics from native iOS and Android apps to cross-platform applications like Apache Cordova and Ionic Framework. An attendee from Couchbase will be speaking about developing offline-first applications using NoSQL database technologies, specifically Couchbase Mobile, to ensure apps function without a network connection by syncing data between local devices and the cloud. The session aims to provide insights into creating resilient mobile applications, and it promises to be an engaging experience for participants.