I hardly dare to come up with a serious answer to your question but here are some tips.
New Year is almost more important than Christmas Eve.
In northern France, children get gifts on St. Nicholas' Day instead of Christmas Day while adults share presents on New Year's Day.
The main Christmas feast is quite grand and is known as 'Le Reveillon', served as a very late supper held after midnight mass on Christmas Eve. Different regions have different traditional menus. Goose is served as the main course in Alsace while turkey with chestnuts is served in Burgundy. Parisians love oysters and pat de foie gras.
French families also bake a Three Kings Cake with a bean hidden in it on the Twelfth Day. The lucky person to find the bean in their slice is crowned the King or Queen
There are family gatherings during the holiday season. Churches and cathedrals are decorated beautifully and Christmas carols are sung and church bells are rung.