I hope everyone who attended San Diego Comic-Con International this year had a better time than Iron Man does in this issue. From January 1975, this is "Convention of Fear!"
This particular issue loosely ties into the "War of the Super-Villains" storyline, featuring a mysterious figure known as the Black Lama who pits villains against each other in a deadly contest for obscure motives. (I haven't read the entire storyline, and from what I've heard, it wasn't that good of one.) We open with Iron Man soaring through the skies of San Diego, when he's attacked by a mysterious assailant, who bolts before our hero can nab him. We later find out that Iron Man - or rather, his alter-ego Tony Stark - is in town to check up on a problem at Stark Industries that requires his attention, only to find it's already been resolved and he made the trip for nothing. He takes the time to interact with his employees, only for the Black Lama to hypnotize some of them into attacking him. Stark manages to subdue them, but the two very different attempts on his life leave him puzzled. Stuck in San Diego overnight and pent up over the recent attacks, Stark decides he needs to do something to unwind. Reading through the local paper, he sees an article about a local comic convention, complete with a costume party, that he decides might be fun. To top it off, he goes in costume as "himself," which nobody so much as blinks an eye at.