You don't need an invite to WES but they send them out every year.
The BerryReview re-union is really a union as such as none of us have actually ever met face to face. Closed house... :-)
I have not been to WES yet. I get an invite every year but the editor at BerryReview goes. It costs a fair bit to attend. (Flights/hotels/etc).
RIM held 2 conferences in Perth last year which I caught up on. Was very interesting but nothing we didn't already know.
Gary and myself are planning on maybe going in the next few years.. but that's a big maybe at the moment.
The BR conference is the first one so don''t know yet. :-)