By the way, that Saturday Mets match was the second-highest draw at Nats Park ever - the new Top 10:
44,685 Saturday 20th August 2011 vs Phillies
42,662 Saturday 18th August 2012 vs Mets [highest of 2012 to date]
42,331 Saturday 19th May 2012 vs Orioles
41,985 Thursday 25th June 2009 vs Red Sox [highest of 2009]
41,918 Sunday 20th May 2012 vs Orioles
41,727 Sunday 21st August 2011 vs Phillies
41,530 Wednesday 24th June 2009 vs Red Sox
41,517 Tuesday 23rd June 2009 vs Red Sox
41,442 Sunday 17th June 2012 vs Yankees
41,406 Friday 15th June 2012 vs Yankees
...and that pushed the 2010 home opener (the Phillies invasion) out of the Top 10.
Also, we're averaging 29,994/fixture this season - a few more houses like this weekend and we'll be averaging 30k+ for only the second time since the franchise settled here.