The Chetty Koyil also has its Amavasya tradition of morning abhishekam taking its Pradosha Nayakar (and Nayaki!) for an ul-purappadu on Amavasya nights–one of the 5 days of the Pancha Paruva Utsavam which include these days:
Amavasya (New Moon)
Pournami (Full Moon)
Ravi Sankramana (Masa pirappu or new solar month beginning)
Krishna Paksha Ashtami (or Theipirai Ashtami, 8th day of dark fortnight)
Krishna Paksha Chaturdashi (Sivaratri, 14th day of dark fortnight).
Abhishekam in the morning is to the respective deities, need to be confirmed. We catch the tail end of this observance in the evening, just the ul-purappadu. When Pradosha Nayakar is returned to the main sannadhi, there’s a small puja, and then prasadam. No nadaswaram players, only the Brahma talam being kept by Govindarajan. Of course, Sankaranarayana sir is present, as he unfailingly is.