Non-religious in general holiday songs
Jingle Bells
Silver Bells
Deck The Halls
Jingle Bell Rock
Rockin Around the Christmas Tree
Let It Snow
Sleigh Ride

Others you can approve song-by-song for corporate events as you see fit.
Hark the Herald Angels
Twelve Days of Christmas
Little Drummer Boy
Santa Claus is coming to Town
Jolly Old Saint Nicholas
O Come All Yee Faithful
Silent Night
I Saw Mommie Kissing Santa Claus
Do You Hear What I Hear
O Christmas Tree
White Christmas
Good King Wenceslas
We Three Kings
Away In A Manger
Angels We Have Heard On High
Joy to the World
Here we Come a Wassailing
I'll be Home for Christmas
O Holy Night
Holly Jolly Christmas
Winter Wonderland
We Wish You a Merry Christmas
Up on the House Top
O Little Town of Bethlehem
God Rest Yee Merry Gentlemen
What Child is This
It Came Upon the Midnight Clear
The First Noel
Have Yourself a Merry Little Christmas