I found these names and dates by reading through ALL the books in the Mage's Guild - they can be found in Wabbajack and The Invocation of Azura - and from summoning Daedra Princes. It costs 100,000 gold to Summon a Daedra at the Mage's Guild.
- Boethiah - Dark warrior, Daedra of Dark Elves
- Molag Bal - Schemer Prince
- Sheogorath - The Mad One
- Azura - Prince of Moonshadow, Mother of the Rose, Queen of the night sky ...
- Clavicus Vil
- Vaernima - Evil (torture)
- Hoermius Mora - Daedra of knowledge, learning, gums & varnishes
- Nocturnal - Night mistress, Unfathomable
- Mehrunes Dagon - Evil (natural disasters)
- Peryite - Evil (pestilence)
- 1 Morning Star
- 13 Morning Star
- 2 Suns Dawn
- 16 Suns Dawn
- 5 First Seed - Hermaeus Mora (Oghma Infinium - Book of Knowledge), but this is tha day I got a hold of Sheogerath and the Wabbajack (Must have been storming).
- 21 First Seed - Azura, who offers you Azura's Star, which is a reusable Soul Gem - handy item.
- 9 Rains Hand - Peryite, who is a cool looking dragon guy and offers you a shield called Spell Breaker.
- 9 Second Seed - Namira, who offers you the Ring of Namira.
- 5 Mid Year - The Guild said there was no summoning on this date.
- 10 Suns Height - Vaernima's summoning date - for the Skull of Corruption
- 3 Hearth Fire - Nocturnal (Wrong date, though ........)
- 8 Frost Fall - Malacath (Valendrung)
- 13 Frost Fall - Mephala (Ebony Blade)
- 2 Suns Dusk - Boethiah
- 20 Suns Dusk
- 20 Evening Star - Molag Bal
Summoning dates troubled by thunder storms belong to the Mad One, Sheogorath. He'll offer you the Wabbajack, which is the coolest and funniest artifact.