If you plan on attending FOSS4G NA this year, Cozzi and I will be there all week. (And I’ll be giving a Cesium talk on Web Mapping Day).
Here’s a blog post with the details: http://cesiumjs.org/2015/02/08/Cesium-at-FOSS4GNA-2015/
Also, if you plan on going all 4 days but haven’t signed up yet, you can use the code SPKR100 to get $100 off.
Hope to see you there!