Brand new to this forum, the business, and tradeshows/events, but I wanted to share our first experience getting our stuff out there.
Each month, usually the first Thursday there is a huge Art Walk in Downtown Los Angeles. http://www.downtownartwalk.org
Within 5 or 6 blocks there are tons of galleries, apparel/fashion stores hosting various parties, dj sets, bands, art exhibits..pretty much anything you can think of. The entire demographic is relatively young 18-25 and to describe in some buzzwords "trendy, urban, fashion-forward".
Amongst this a free publication Citizen LA hosts an Art Park where various vendors can setup booths, primarily, artists, crafters, and shirt companies.
We had a booth setup this last Thursday for the first time and it was a great experience. 100s-1000s of people flowed through the area and we got some great exposure and sold a handful of shirts.
I suggest you contact them but to give you the nitty-gritty details:
Time: 3-10pm (people didn't really start showing up until 5-6)
Space: 10' x 10'
Details: Power supplied but limited to 100w unless you have your own power supply or something.
Sorry for the long post..hope this is helpful to the local LAers.