According to his website, John Barrowman will be in attendance at San Diego Comic-Con 2013!
[John is returning to San Diego Comic Con, which this year will be held at the San Diego Convention Center from 18 to 21 July. John is scheduled to attend for the first three days, 18 to 20 July]
We do not know in what capacity Barrowman will be attending just yet. We’re crossing our fingers its for a star studded 50th anniversary Doctor Who panel!