Aavani aavattam falls on the 10th of the August for the Yajur Vedam and Rig vedam. Saama vedam celebrates this on the day of Vinayaka Chaturdhi. Aavani aavattam is the only festival for the Brahmin Men and hence it is celebrated in a very special and grand manner. Typically the men with the boys go to the temple or any priest home or place and get the new poonal. Boys who do not have the poonal get a false poonal or kalla poonal and they take immense pride in that.
My patti/grandmother always insisted that the women in the house had to make this day very special for men and hence my mother always followed that tradition and she passed that on to me.
The specials that you can make for the day apart from the regular lunch –