Yes , there are many promotional items given away at comic conventions including comic books .
Cheap Cool Crazy - 2012 Special Comic-Con 2012 Episode Ft- Signed Batman Comics Giveaway 1-23 was released on: USA: 19 July 2012
The London Film and Comic Con debuted in 2004 whereas San Diego Comic-Con International debuted in 1970.
Comic Con India was created in 2011.
Chronicles of Comic Con - 2012 Kill Time at Comic Con - 1.3 was released on: USA: 7 October 2012
Chronicles of Comic Con - 2012 Comic Con Dos and Donts 1-1 was released on: USA: 10 July 2012
Chronicles of Comic Con - 2012 Kill Time at Comic Con 1-3 was released on: USA: 7 October 2012
Central Canada Comic Con was created in 2006.
Big Apple Comic Con was created in 1996.
New York Comic Con was created in 2006.
A Comic Con (Comic Convention) is a planned event that targets an audience whose interests are in the comic book industry , artists , vendors and related events .
San Diego is kind of "the original", but there are many others (and SDCC has arguably gotten "too big" and is not really about comics per se anymore). There's one in New York, for example, and there's the Emerald City one in Seattle, and the Small Press Expo in or near Bethesda, MD.
San Diego Comic-Con International was created in 1970.