https://en.wiktionary.org/wiki/biannual
"Although biannual properly means twice a year, its conflation with biennial (once every two years) is quite common."
Maybe, but you need a venue. Plenty of places would be great for travel reasons but there aren't many accessible venues or ones in the right kind of price rage/size
There are hundreds of places in Birmingham. The NEC comes to mind but maybe too big/expensive. There are hundreds of function rooms in Birmingham, just need to pick one.
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