Sorry!!
I didn't do anything for Shivaratri. I grew up in Vaishnavism and don't know much about the traditions of Shaivism or Shaktism. I'm only now starting to learn more.
I'm not sure what my favourite festival is. Probably Janmashtami, Krishna's appearance day. And the reason is specifically because of my connection with Krishna, who I view as God and love itself. On Janmashtami, worship begins at dawn and ends at midnight. Here is a description of the worship:
"Where Vaishnava temples exist, festivities begin before dawn and extend all day until midnight, the exact moment of the anniversary of Krishnas appearance. Events include kirtan, singing the Lords name along with other devotees; and japa, private, more intimate prayer. Some devotees cook a feast of over one hundred dishes, while others perform drama and dance. Some clothe and decorate the deity of Krishna while others string enormous flower garlands and other decorations for the temple. Incense burns, scriptures are read, and all but the young and the infirm fast all day. The deities are also bathed with a variety of auspicious liquids in a kind of ablution
ceremony called abhisheka. Sometimes taking over two hours, this is performed with great pomp.
Finally, at midnight, priests pull apart the curtains to reveal the
freshly dressed deity of Krishna on a creatively festooned and colored
altar. The excitement builds, and a rousing kirtan ensues."
How to Celebrate Janmashtami | Krishna.com