Since you didn't get the oath letter (strange) how did you know that you have Oath on Saturday? Did you call CIC? What is ECAS saying online? Also, please share your timeline. Thanks.
yes buddy i am taking the oath on Oct 24, 2015. it is normal as they keep ceremonies on saturday and sunday in special cases i requested it when i went for my test. they told me it will take long but surprisingly its not that long.
TimeLine
Recvd Application : January 23, 2015.
Reciept : March 4, 2015.
Started processing : March 25, 2015.
Notice to appear for test : July 17, 2015
Citizenship test : August 7, 2015 at 10:15 AM
Notice to appear for Oath : September 29, 2015
Citizenship ceremony : October 24, 2015 at 1:00 PM