View source for PEG:Event calendar 2010/2011

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===October===
* 22th-25th: USACO October 2010 Qualification Round (may or may not occur)
* 27th: DWITE round 1

===November===
* 5th-8th: USACO Elite 2010 November Competition
* 24th: Canadian Open Mathematics Challenge
* 24th: DWITE round 2

===December===
* 3rd-6th: USACO Elite 2010 December Competition
* 15th: DWITE round 3
* 24th: ACSL contest 1

===January===
* 7th-10th: USACO Elite 2011 January Competition
* 12th: DWITE round 4

===February===
* 2nd: NACLO Open Competition (first round)
* 4th-7th: USACO Elite 2011 February Competition
* 8th: AMC 10/12 A
* 11th: ACSL contest 2
* 23rd: AMC 10/12 B
* 23rd: DWITE round 5
* 24th: Pascal, Cayley, and Fermat Contests

===March===
* 1st: CCC stage 1
* 7th: APMO
* 10th: NACLO Invitational (second round)
* 11th-14th: USACO Elite 2011 March Competition
* 15th: ACSL contest 3
* 17th: AIME I
* 23rd: CMO
* 30th: AIME II

===April===
* 12th: Euclid Contest
* 13th: Fryer, Galois, and Hypatia Contests
* 15th: ACSL contest 4
* 26th-27th: USAMO
* 28th-May 2nd: USACO Elite 2011 U.S. Open Competition

===May===
* April 28th-2nd: USACO Elite 2011 U.S. Open Competition
* 11th: Gauss Contest
* 16th-20th: CCC stage 2
* 28th: ACSL finals

===June===

===July===
* 13th-24th: IMO 2011
* 22nd-29th: IOI 2011

===August===