Here is an article which describes the significance of Vaikaasi Month. Every year, Vaikaasi months falls between the mid of May to mid of June. Vaikaasi month has lot of significance such as thirunakshatram of Namazhwar, Kanchi Garuda sevai and many more. This article is written by Sri U.Ve. Vidwan Brahmadesam Thoopul Narasimhacharya Swami of Kanchipuram.
Had the author been alive today, he would have modified the article by adding the name of HH Srimad Andavan (Srimushnam) also