When does Super Battle opera & Tokyo Game show normally happen

I am going to JPN in 2011 but I am really hoping it’s in September like thias year, as I would have love top have gone this year to JPN.

I would have done the baseball pennant, sumo tournament, DREAM MMA, SBO and TGS

I am very annoyed I never found this out earlier as I would have love to have gone.

I just want to know about TGS & SBO dates in the past and when do they annouce dates at the earliest for SBO finals and TGS