If you are in the NCR on the Victoria Day weekend (19-21 May) check out the annual Tulip Festival and the display at Landsdowne Park. There will be military vehicles, a military encampment and reenactors doing the heroic Battle of Landsdowne Park (standing in for Groningen) so there will be lots of booms and bangs going off (afternoon of the 20th) . Friday night (19th) there is a swing dance (if you are into that) and a big band playing on Sat the 20th..................... Oh yeah there is a couple gazillion tulips to see also.