Have a card with each letter on it. 

As boys hold their card have them say the following:

T - is for the Thanks we give at this special time of year.

U -  is for Uniting of families from both far and near.

R - is for Remembering that first Thanksgiving Day.

K - is for the Kindness we show to people along the way.

E - is for Everlasting peace our forefathers showed long ago.

Y - is for You, that's what we'll need to help and make it so.

The 1st Thanks giving was in 1621 and lasted 3 days!

This poem is an excellent source in November.  As an opening a den can make posters depicting the picturesque words.  What better way to close a meeting than Thank You.