I work on the instructional side of technology in K-12. I would suggest the yearly ISTE conference. It rotates around the country in late June. Next year it will be in Philly, I believe. It is massive and has sessions on instruction, administration and pretty much anything else you can imagine. The vendor area usually draws the latest heavy hitters in software, services and hardware.
You may also want to check and see if your state has an ISTE affiliate group. They often hold quality state conferences as well. Here in North Carolina, we have NCTIES in March. It's good for a state conference.