Landing Day: This is the day the ship came to land on Kerren. It is a day of general thanksgivings, getting together with families, new beginings (and forgiving people), and presents. June 12 Thank you Manfred
Days of the Ship: Any time between the colony being set up to 25 years after they arrived. The ship's resources had all been used up by that date. (Onterio's Taming of Dragons occurs about 15 years after landfall).
Founding Day: Each Warren/ Ward has its own founding day. Some free clusters and villages have their own founding day. It is a day that there is some kind of traditional party and silly game they play. It could be a kite contest, it could be mountain climbing, log rolling, or dodging the stampeding herd of GIP (like running of the bulls except slower).
Solsticetide: July 1. This is the Summer holiday on the longest day of the year, the Summer solstice. Generally an excuse to drink and dance. Technically it happens twice a year. July 1st for the Northern hemisphere and Jan 1 in the southern.
There are a number of fairs and tournaments in each area. The Grand Tournament, held at Firstdown, is the last week of June and often includes Solsticetide. The Grand Tournment is the Big One. You have to have one a regional tournament to compete in this huge event. This event hosts dozens of wings competing in a variety of events, and other county fair like events occur.