FOSS4G NA is a great conference on open-source geospatial software. This year it is in May in Minneapolis.
Sorry for the very short notice, but if you want to submit a presentation proposal, they are due tomorrow. I submitted a talk for a general overview of Cesium. It would be great to have more Cesium-related talks, perhaps centered around apps you are building.
Also, if you are attending, let me know so we can meetup.