That's ok. We all learn by asking....I found this one and I hope this one will explain it better....

Samhain Hallowe'en 15°: Taurus May 1 Pagan New Year, Honouring the Dead, Cleansing and releasing

Yule Christmas Winter Solstice ~ Jun 21 Rebirth, Life triumphs over death

Bridgid Imbolc Candlemas 15° Leo Aug 1 Purification, Initiation, Dedication

Eostara Lady Day Easter Spring Equinox ~ Sep 21 Conception, Regeneration, New Beginnings

Beltane May Day May Day 15° Scorpio Oct 31 Passion that fuels Life, Joy, Fertility

Litha Midsummer Summer Solstice ~ Dec 21 Transition, Planning

Lammas Lughnasadh First Harvest 15° Aquarius Feb 2 Gratitude, Abundance, Fruition

Mabon Thanksgiving (Second Harvest) Autumn Equinox ~ Mar 21 Giving thanks, Reflection

I am no help with your questions about rituals etc due to my different path but the others sure can help you with that.
Peace, Romana

I just wonder. Samhain Is the 1 November. But often you celibrate at night? Why the night? And wich night? The 31-1 night, or the 1-2 night?

The 31-1 night usually. I suppose that that goes back to the idea that the day starts and sunset and goes to sunset. Of course I don't know how many actually realise that, being that we tend to follow the Roman calendar in modern times.