The calendar

The game designers did not want to mess with strange orbital and rotational periods, so the calendar of Tamriel is simple: 24 hours per day, 30 days per month, 23 months per year. There is a major holiday throughout the Bay at least once per month and individual provinces and regions have their own holidays. Most major holidays have some benefit to your character, but local holidays are for atmosphere only.

Month	Holiday	Comments
Morning Star	1st - New Life	Free ale at taverns
	15th - South Wind's Prayer	Free healing at temples
Sun's Dawn	16th - Hearts Day	Free tavern rooms for as many nights as you want, if rented today
First Seed	7th - First Planting	Free cures at temples
Rains Hand	28th - Jesters Day	Nothing special
Second Seed	7th - Second Planting	Free cures at temples (full price for healing wounds)
Mid Year	16th - Mid-Year	Temple blessings at 1/2 price
Suns Height	10th - Merchants Festival	All stores 1/2 price
	20th - Suns Rest	All stores closed
Last Seed	27th - Harvests End	Free drinks at taverns
Hearth Fire	3rd - Tales and Tallows	1/2 price goodies at Mages Guildhalls
Frost Fall	13th - Witches Festival	Free identification of magical items and 1/2 price spells at Mages Guildhalls
	30th - Emperor's Birthday	Nothing special
Suns Dusk	20th - Warriors Festival	1/2 price weapons
Evening Star	15th - North Winds Prayer	All temple services are 1/2 price
	30th - Old Life Festival	Free ale in taverns

Daedra summoning

Unless you just like spending a few hundred thou', the only reason to summon a Daedra is to get an artifact.

There are only three ways to summon a Daedra:

each Mages Guild has a Daedra Summoner available to members of rank 6 or higher;

most temples have a Daedra Summoner available to members of the appropriate rank (usually rank 7);

Witches Covens will summon for anyone who has the money

Each Daedra Prince has a particular day of the year when he/she/it can be summoned with a reasonable degree of certainty. Temples and Mages Guilds will only summon on those days. If you try to summon on any other day, you will be politely referred to the library to go do a little research. The base cost to summon is 100,000 gold pieces, plus an additional amount of up to 100,000. This additional amount is modified by your rep with the summoner, so the higher your rep, the less it will cost you.

Witches Covens will summon every day, but the Daedra Prince is randomly determined each day. The Glenmorial Witches will only summon Hircine, however. The odds of a Prince showing up is determined by your rep with that Prince, but there is always a 5% chance that Sheogorath will show up, so save the game before attempting any summoning. The cost to summon at a coven is a base 100,000 plus an additional 100,000 minus your rep with the coven times 1000 (for the non-math-impaired, that's (100K + (100K - (rep * 1000)))). The higher your rep with the coven, the less it costs.

Finding a Witches Coven is the hard part. There are a couple of noble quests you can get that will net you a map showing the location of a coven. Covens appear as black squares on the overland map. The second way requires having the v.212 or v.213 patch installed and using the appropriate cheat code (<ctrl>+f1 in this case) to make everything show up on the overland map.

If you don't want to mess with that, the following are maps and directions to the various covens. Traveling cross-country is slow going, so if you want to make it easier, install the v.212 or v.213 patch and use the super-speed cheat (the "1" key) to get there faster. Except for The Coven of the Peaks and the Tamarilyn Coven maps (which are mine), all other maps and directions are courtesy of Bethesda Softworks.

Daggerfall: Coven on the Bluff is on the western seacoast. To find it, go south from the Burning Martyr of Kynareth.

Ilessan Hills: Glenmorial Coven is located in the eastern central area of the province. Go north-northwest of Old Chrystausa's Place

Shalgora: Daggerfall Coven is on the border with the Daggerfall province.  Go south-southwest from Woodham Manor.

Daenia: Beldama Coven is in the north central area of the province. It is south of Greenham Manor and northeast of The Old Masterhouse Shack.

Phrygias: Skeffington Coven is near the border in the south central area. Go west from Old Barbyn’s Farm.

Alcaire: Alcaire Coven is in the northwestern area near the border. Go southeast from The Ashsmith Plantation.

Wrothgarian Mts: Wroth Coven is near the southeast edge of the map. Go east from Deerville.

Dragontail Mts: Devilrock Coven is on the northern coast. Go west from the Joyous Altar of Arkay.

Dragontail Mts: Coven of the Peaks is down in the southeastern corner of the map. Go south from the Reliquary of Sai, East from Old Khoctba's Shack, or northwest from the Baircta Farmstead.

Dak'fron: Kycos Coven is in the central/southwest area. Go west from Cerumbator.

Alik’r Desert: Coven in the Marsh is on the northern border, near the middle. Go northwest from the Gentle Star of Stendarr.

Antiphyllos: Coven in the Dust is in the western part of the province. Go northeast from the Perpetual Sunrise of Mara.

Myrkwasa: Coven of the Tide is about in the middle of the province. Go southeast from Rhanotujer or northwest from Thofyl Manor.

Menevia: Tamarilyn Coven is near the end of the small peninsula. Go east from The Dunyak Excavation or northwest from Tamborne.