The Fall Festival (also called the Harvest Festival or Harvestmath) has started, scheduled to run through November 5th.
Of particular interest for level-cap characters are Anfalas Star-lit Crystals for 90 Fall Festival Tokens and Essence Reclamation Scrolls for 140 Fall Festival Tokens. As usual, the Star-lit Crystals are Bind on Acquire, so must be bartered by the character that is going to use them. The Essence Reclamation Scrolls are not bound, so can be sold, traded, or passed to other characters. They are in demand, so a low-level character can make some gold by selling them on AH.
There are Premium dyes available: 6 Autumn Leaf Dyes or 6 Twilight Purple Dyes for 20 Fall Festival Tokens, and 6 Imladris Fallen Leaf Dyes or 6 Asheslades Green Dyes for 10 Mithril Coins. These dyes are available only during the festival, so they may become valuable. I have been selling Premium dyes from other festivals. The market is very thin and some are more popular than others. Over 15 months, I've sold over 2500 Premium dyes at an average price over 8g. Of course, if you like the colours and think you might want to use them, you need to stock up now.