I will be at three more conventions the next three weekends (because, basically, I'm insane):
This weekend I will be at 
Balticon 53 in Baltimore, Maryland. I'll be spending a lot of time at the eSpec Books booth in the dealer room selling and signing books, and we'll be having the launch party for 
Mermaid Precinct Sunday night. I'll also be doing panels and a reading -- 
my full schedule is here. Also at this con will be fellow 
Trek (and 
Stargate) novelist Melissa Scott and fellow 
Trek comics scripter Steven H. Wilson.
From 31 May - 2 June I'll be at 
GalaxyCon in Richmond, Virginia, and then from 7-9 June I'll be at 
PopCon in Indianapolis, Indiana. For both those I'll be at the Bard's Tower booth on the exhibit floor selling and signing books. I might be doing programming at one or both of these, but that's not confirmed yet.
Also at GalaxyCon will be 
Trek actors Denise Crosby, John deLancie, Michael Dorn, Terry Farrell, Deep Roy, and Brent Spiner.