About.com has some nice suggestions for local Mother's Day specials, & there will be a Mother's Day Concert at the Biopark, if you need some last minute suggestions!
Regardless of your plans, whether you are a mother or a child, consider checking out one of of these books about motherhood & mothering from the library catalog!
A Life's Work: On Becoming a Mother by Rachel Cusk
Operating Instructions: A Journal of My Son's First Year by Anne Lamott
Confessions of the Other Mother: Non-Biological Lesbian Moms Tell All edited by Harlyn Aizley
From Harvey River: A Memoir of My Mother and Her Island by Lorna Goodison
Why Be Happy When You Could Be Normal? by Jeanette Winterson
Making Babies: Stumbling into Motherhood by Anne Enright
Mom: A Celebration of Mothers from StoryCorps edited and with an introduction by Dave Isay
Best Friends, Occasional Enemies: The Lighter Side of Life as a Mother and Daughter by Lisa Scottoline and Francesca Serritella
The Lives Our Mothers Leave Us: Prominent Women Discuss the Complex, Humorous, and Ultimately Loving Relationships They Have with Their Mothers by Patti Davis
Memoirs of motherhood & mothering
Are You My Mother?: A Comic Drama by Alison Bechdel
My Mother's Clothes: An Album of Memories by Jeanette Montgomery Barron
Cocktail Hour Under the Tree of Forgetfulness by Alexandra Fuller
Recent & controversial!
Battle Hymn of the Tiger Mother by Amy Chua
Bad Mother: A Chronicle of Maternal Crimes, Minor Calamities, and Occasional Moments of Grace by Ayelet Waldman
There is also a large selection of books to share with children about mothers under the subject heading "Mother and child - Juvenile fiction".