Have you ever been at a convention?

Never been to one. It would be cool to meet some celebrities even though they charge for autographs/photos.

I attended national professional conventions for two year, one in New Orleans and one in San Francisco. Then the early 2000s tech crash occurred and nearly bankrupted the city I worked for so traveling expenses were right out.

Attended (with my two sons who were 9 and 7 at the time) the huge Doctor Who convention in Chicago (second largest for Doctor Who fans in the U.S.) called Tardis 21 in November 1984. Four of the six Doctors attended (William Hartnell was dead and Tom Baker wasn’t having anything to do with fandom) plus companions from all eras. The last season for Doctor #5 (Peter Davison) hadn’t played in the U.S. but Tardis attendees got a preview of Resurrection of the Daleks.

We went back the next November for Tardis 22. That year I did some cosplay before there ever was such a word. The first day I went as the Second Doctor. Both of my boys wore long Fourth Doctor scarfs.

The Second Doctor (Patrick Troughton)


The Fourth Doctor scarf

I've attended several, in San Antonio, Austin, and Houston.   I've met William Shatner, Peter "Chewbacca" Mayhew, James Marsters, Stan Lee, George Takei, Edward James Olmos and most of the primary cast of Battlestar Galactica (old and new), Kathy "Land of the Lost" Coleman, plus I've also seen Lou Ferrigno, Bruce Campbell, Patrick Stewart, Sean Astin, Ray Park, and others I'm probably forgetting already. 

Did you get any of their autographs/pictures with them?  

I went to Cleveland wizard con last year, and a few much smaller horror conventions over the years. Personally I find the horror conventions to be depressing, they don't get a lot of traffic so it's a lot of venders just trying to guilt trip you into buying stuff, and you see irrelevant actors from old horror movies just sitting around bored waiting for someone to come pay for their autograph. Once, I saw Dan Hicks (Evil Dead 2, Intruder, Darkman) sitting at his booth looking so sad and felt obligated to go get his autograph because I love him in those movies. I went to the Synapse Home Video booth and asked them if they had the Intruder blu-ray, which I already own, but they were sold out. Wizard Con was a fun experience that I'd recommend seeking out if there's a reasonably sized city in your area. It's 90% merchandise booths filled with stuff you don't need or want, but the cosplay culture makes for good people watching. I went to several panels, including a Q+A with Sean Astin which I enjoyed a lot, and it was cool just seeing these celebrities walking around. Jason Momoa walked right by me and my girlfriend. Like I said earlier, I'm not inclined to pay to meet celebrities (unless they look really sad), but it's a fun time.

Many......Monsterpalooza / Son of Monsterpalooza and Designercon every year..Went to several Star Trek cons in the 90's and SDCC before it exploded and morphed into the behemoth it is now..bunch of different horror themed cons over the years..

They can be fun. Cool exhibits and interesting stuff to buy, at most..Celebs can be fun and have met some real nice ones..(Angus Scrimm and Peter Mayhew might be the most pleasant (Both sadly passed) and Walter Koenig might be the crabbiest) ..Got chewed out by Mark Hamill at a signing, because he thought I was a collectibles dealer rather than a fan (Didn't want personalization on some movie posters I was getting signed by some of the SW cast) which was funny..

I got  autographs from Stan Lee, Will Shatner, George Takei, Peter Mayhew, James Marsters and got both autographs and pictures with Kathy Coleman and Dirk "Starbuck" Benedict!  A real thrill meeting these childhood heroes.  Most of them were really nice, but Stan Lee and Peter Mayhew were basically "hello, here's your autograph, next!" 

No I haven't, it's on my bucket list though.

I went to a SF convention and a writer's convention. Very lowkey, not corporate-sponsored, no celebrities.
The most interesting thing in the SF convention was a table of kaiju models, it was that low-key.
One room was playing Transformers the Movie on a tv--no one was watching.