Hello again! You know what's up? Doctor Who Comic Convention! Click this link for Actor Appearances:  http://doctorwhoactorappearances.blogspot.com/
Click this link for David Tennant's appearance: http://massiveevents.co.uk/lordsoftime/
Click this link for Billie Piper's appearance: http://www.starfury.co.uk/
For more questions on actor appearances, please comment below!