sql subquery

i have sql information looks this

events
id name         capacity
1  cooking        10
2  swimming       20
3  archery        15

registrants
id  name
1   jimmy
2   billy
3   sally

registrant_event
registrant_id  event_id
     1             3
     2             3
     3             2

i name fields 'events' good an additional domain array now purebred event. box archery have 2 registrants, swimming have 1, cooking have 0.

i suspect achieved unparalleled query nonetheless i'm certain repremand syntax. how query combined data?

update: interjection good answers, rock!