Here is the camelcamelcamel guide to 2015's key holiday shopping dates at Amazon.
Christmas deals will be running from October 26th to December 13th, with Amazon offering delivery-by-Christmas up until around December 20th, depending on your location.
Black Friday & Cyber Monday
Black Friday has become a full week in recent years, and is happening from November 23rd to November 29th. This will be capped off by Cyber Monday on November 30th. In the past, there has been a lot of deal offerings coming out of Amazon, so be ready to scour their listings for the gems. Expect lots of items that make great gifts: toys for kids, electronics and video games, etc.
Boxing Day & New Year
For shoppers in (current and former) Commonwealth countries, there will be a Boxing Day sale running from December 21st to the 31st.
Finally, Amazon will be holding various New Year-related sales events during the first two weeks of January 2016. Look for products related to New Year Resolutions, like exercise equipment.