How would I go about changing the format of date display in events+

Howdy all,

I'm not sure if this is going to be easy/possible to do with out messing with the core files but.....

how would I go about changing the date descrition in the events archives page and event single page so the date is displayed as

17&18 August 2013, 10am to 4pm

instead of its current format which is

Takes place on August 17, 2013 from 10:00 am to 4:00 pm
and Takes place on August 18, 2013 from 10:00 am to 4:00 pm

Thanks in advance

cheers,
D