Skanda Sashti, the sixth day in the bright half of the month of Aippasi, is celebrated in Saivite temples all over Tamilnadu, and with an extra measure of grandeur in temples dedicated to Subramanya.
Kaarthigai Deepam is a festival of lights, celebrated in the Tamil month of Kaarthigai. It is celebrated on the full moon day of the Kaarthigai month which coincides with Krithikai star. It is also considered as the extension of the Deepavali festival.
There are 24 Ekadasis observed by Hindus during the year. Of these Vaikunda Ekadasi celebrated in the Tamil month Margazhi (Dec-Jan) is considered very auspicious.
In the pooja room do not place pictures of Gods along with pictures of departed souls like grandfathers, great grandfathers etc. You can place them in the pooja room on a different side. For eg., if Gods are placed facing east you can place the pictures of the deceased facing south or north etc., If you worship this way then the blessings you will receive will be several fold.