The Farmer's Faire has started, tentatively scheduled to run through September 15th. https://www.lotro.com/forums/showthread.php?646192-The-Farmer-s-Faire-has-arrived!
The notice promises new rewards and surprises, but I'm not big on cosmetics so someone else can speak to those. There are no festival dyes for the Farmer's Faire. (Recall that they are slated to appear at the 4 seasonal festivals Spring, Summer, Harvest and Yule.)
Of particular interest for level-cap characters are Anfalas Star-lit Crystals for 120 Farmer's Faire Tokens and Essence Reclamation Scrolls for 180 Farmer's Faire 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.
Although the number of tokens for the crystal or scroll is higher than other festivals, it is adjusted based on how easy it is to get tokens for a particular festival. It turns out doing the Ale Association and Inn League delivery quests will still get you about one Star-lit Crystal per day.