File this one under "if it's too good to be true, its probably too good to be true."

I got a conference invitation to present my work at the 3rd "world congress of Catalytic Asymmetric Synthesis" in Beijing this spring. I was intrigued and excited to present, but I have to admit, even from the first email, red flags were going up.  The very first email I got from them said something like they hadn't heard from me after their initial email a few days ago. I put together an abstract and got on the program and was happily planning my trip to China.