Aadi Krithigai is a day auspicious for Lord Muruga. This year it falls on July 20. Karthikeya or Muruga is the second son of Lord Shiva and Mother Parvathi. Interesting and inspiring are his birth and feats, which are elaborately described in the Skanda Purana.
Aadi Amavasai, a day sacred to obsequies for the manes. This special day is dedicated to our forefathers, which is observed annually during the Tamil month of July-August.
Garuda Panchami pooja is dedicated to Sri Garudalwar, also known as "Periya Thiruvadi". This pooja is usually performed by women and benefits their children. Garudalwar is propitiated by women who wish to give birth to bold, brave and sharp-minded children like Garudan.
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.