I went to a "warhammer" convention with my son (at the insistence of my ex) and thought I would be intimidated by the whole thing...
Never was I so far off base with an assumption.
Loved the whole thing and found a couple of events I dove right into.
OK only two guys besides me at a table of about 40 kids in full warhammer nerd mode.
Oh and did I mention the females in pixie / elf costumes 
Me and a fellow dad found a bar too and got on quite well.
Seemed he was also forced to attend.
They also had a dad's section with TVs and such.
Same sort of scenario though and went from being a wallflower to a great day out !
Yes it cost me a good chunk of cash but I would do it again in a heartbeat