Possible Clues:

• Calendar heading named for a Norse deity: Abbr
• Abbr. for a word also with abbrs. by its first four or first five letters
• Fri. follows it
• Two before Sat
• What Fri. follows
• Day of the week named after Thor (Abbr.)
• Cal. abbr
• "Turkey Day" day: Abbr
• Day to post a throwback picture: Abbr
• Two days before Sat