My roommate's father is a vendor and he and I often go out there to help out. I have heard of a toy show sometime before the end of March. Again this is just what I heard.
If it is indeed in March, it has to be the 23rd or the 30th.
My roommate is going to go out there Saturday and he is going to try to find out when it is.
When I find out I'll post it right here for you.
If you go perhaps we can meet up too.