When is the last time a team has played consecutive double-headers?
Personally, I am shocked that the game has been rescheduled - the odds of it mattering are extremely slim.
The CBA forbids scheduled doubleheaders on consecutive days but doubleheaders were not uncommon back in the days. I don't know which team had the most recent but here are some interesting facts about doubleheaders:
From July 28 to August 17 (a 21 day span) the 1901 Washington Senators played 9 doubleheaders.
From July 27 to August 5 (a span of 10 days) the 1909 Washington Senators played 8 doubleheaders with only July 1 and 2 as off days in between.
In 1911 the Cincinnati Reds and St Louis Cardinals played doubleheaders in 4 consecutive days (May 29-June1).
From September 4 to September 15 (a span of 12 days) the 1928 Boston Braves played 9 doubleheaders (2 of those days were on the road) with only days off on the 6th, 9th and 12th. And if you extend it back to August 24th of the same year all the way to the 24th of September they played an additional 8 doubleheaders for a total of 17 doubleheaders in a 32 day span.
The most doubleheaders played in the NL in the same season belongs to the 1943 Philadelphia Phillies who played 43 doubleheaders. The Chicago White Sox that same season played in 44 doubleheaders.