I am in presentation mode for the ESRI UC and EdUC already and reminders of other ways to contribute to the conferences keep popping up on my radar. You can submit up to three images by June 15 to be considered for presentation during the conference plenary. You can also submit to the Map Gallery and the new Virtual Map Gallery.
This year the number of concurrent conferences has increased as well. If you are going to be in town for the UC you may want to look into the long standing EdUC and Survey & Engineering Summit, the 2nd Remote Sensing Summit, and the newly moved Business GIS and Homeland Security Summits.
For more information about the concurrent conferences and submission guidelines head over to http://www.esri.com/uc.