I may write separate questions on how you like checking out guys who are casually dressed or undressed. This question is about how you like guys who've been incentivized to dress a certain way. (Though you could take a loophole. If you like boxing matches because muscular guys are wearing nothing but shorts for you, check the "athletic events" option.)
Remember also that each option has quite a range.
Athletic events could be anything from a swim meet to a skiing competition. Most common examples would probably be track & field.
Business and work events could be anything from construction workers on projects to soldiers in uniform for ceremonies. Most common examples would be sales presentations with guys in business suits.
Club nights and concerts could be anything from grunge rock to opera. Most common example might be a mainstream club on a big night. (Note that this option applies if your preference is for the male ticketholders, not the performers.)
Costume events could be Halloween parties (of course), theater, or distinctive performance art. (In this case, applies if your preference is for costumed men in attendance OR for the performers.)
Comments with specifics or alternatives are welcome, of course!
- An athletic event!
- A business or work event!
- My kind of club night or concert!
- A costume party or show with unusual fashions!