A Woggle of Witches by Adrienne Adams, 1971.

Witches live in a dark forest, sleeping in hammocks in the trees.  When they wake up on Halloween night, they have a feast.

Then, they take to the skies and fly in fancy formations.  They fly in rings around the moon, even stopping on the moon to take a rest.

After they return to the ground, they are startled by some trick-or-treaters and hide from them, thinking that they’re monsters.

Finally, they return to their forest and go to sleep in their hammocks once again.

The story is minimal, but the pictures really make the book!

The book is available to borrow and read for free online through Internet Archive.