On Saturdays March 24, April 7, April 14, and April 21 from 2:00 p.m. to 3:30 p.m. there will be presentations on art, sound and technology. Check http://openspace.ca/Trimpin_2012 for more details.
For physical events that happen at a specific time. For example a concert, or dance performance. If there are multiple shows, you can still duplicate your event to cover them all.