A year ago I started a series on posts on the sabbats. I started with Samhain which was fitting because it's one of my favourites (along with Lammas) and also it's considered the Witches' New Year. Other Samhain themes are ancestors returning since this is one of one of the two times of the year when the veil between the worlds is said to be thin (the other is Beltane), honouring your ancestors and those you've lost, and shadow work. It's also the 3rd and last harvest (after Lammas and Madron), so you can think about what you've harvested in the past year and/or season. Read last year's celebration post here: https://livingseasonal.blogspot.com/2016/10/halloweensamhain-celebration-ideas.html
Note: If you're in the Southern Hemisphere it's Beltane so you might enjoy this post on ideas for celebrating: https://livingseasonal.blogspot.com/2017/04/beltane-celebration-ideas.html
This year I'm posting about more Samhain celebration ideas. First of all here are a few links with information about Samhain and Hallowe'en (since they are closely linked):
Samhain- The Precursor to Halloween: https://www.stneotsmuseum.org.uk/articles/samhain-the-precursor-to-halloween/
10 Folk Beliefs about Samhain/Halloween: https://tesswhitehurst.com/10_folk_beliefs_about_samhain_halloween/
The Herbs and Astrology of Samhain: http://www.wortsandcunning.com/blog/the-herbs-and-astrology-of-samhain