Filter by vocabulary with multi-select

Hi,

Our calendar is pretty busy. I would like to see a filter on the calendar page that allows multi select out of multiple different vocabularies/taxonomies. For Instance we have the following taxonomies (simplified)

Event Type: Adrenaline, Meeting, Pub, Club, Party, Weekend, Holiday Abroad etc.
Event Size: Area, National, and Group
Organising Group: Southampton, Birmingham, London, Heathrow

Our would like the user to be able to filter with the choice or OR-ing or AND-ing the multi-select boxes for each event vocabulary, if nothing is selected in out of a vocab, then that filter would be disabled (show all for that particular) all other filters would remain on.

This is so that they can see a customised view, For instance live in Chiswick in London, they would like to see events organised by both London and Heathrow as both are within travelling distance.

Hope that makes sense and would be useful to others

Thanks

Richard