I would be keen to agree a focus, but I wouldn't expect everyone to take part in a tournament or similar. Everyone playing mordheim 4 years ago, and frostgrave 3 years back worked really well.
I'd like to see the 9th age played, but would happily swap for kings of war or 6th edition if more people were interested.
As for dates, April and May are fine. August should be fine, but I couldn't commit for around 6 weeks, November again should be fine but can't guarantee for a while yet.