On the weekend of 15/6/2012 it should be possible to see all of the 150 Dunlop objects in one night.
Maybe we could have a Dunlop Marathon. (new moon is 19/6/12)
The objects nearest the Sun on that date are NGC 2090 and NGC 2298.
In the USA they have Messier Marathons.
http://www.robhawley.net/mm/