@Mike D. I attended the REI Expo in Baltimore earlier this year and found it to be worth a weekend and the associated costs with driving up from the DC area and staying overnight. Although there were a few guru seminars that were very sales pitch oriented, I found them to be the exception rather than the rule. many local investors groups from the surrounding area were also invited to speak and I found these to be, by far, the most useful presentations.
Additionally, in Baltimore, there were usually about 4 speakers going at any one time, so if you found that one wasn't really covering items of interest, you could wander out and into another presentation that was more interesting.
If you are investing in the LA area, I would recommend going. If you are investing more in your local market, I think the expo will give you some good general ideas, but won't be as interesting for your market specifically.
I am actually interested in investing in Texas, so will probably fly out to attend one of the expos held there at some point. it's a great way to meet local vendors, which I think is also one of the best parts of the expo.