April 29 - May 2 in Chicago.
The 2019 AUVSI XPONENTIAL is being held in Chicago in April-May. If you are in the market for anything having to do with a drone, this is the event to attend. There will be educational seminars and 700 exhibitors. Besides drones, you need to be thinking about what sensors you would like to have to maximize the utility of your drone.
Don't forget to have a policy in place and political approval before you go buy the equipment!