Show latest event in wdiget

The widget by default show future events, so just limit the number to show to 1 and you have what you need. Concerning what info to show: read up on placeholders here:
http://www.e-dynamics.be/wordpress/?cat=23

Sure, instead of scope=future, use scope=past. But you’ll need to use 2 times the same widget then (one for the future, one for the past event)