srI:
srImathE satakOpAya nama:
srImathE rAmAnujAya nama:
srImadh varavaramunayE nama:

There are several sannidhis and uthsavams that happen for the emperumAns, AzhwArs and AchAryas in this dhivya dhEsam.

• Presiding deity
  • mUlavar –  perumpuRakkadal with srI dhEvi and bhU dhEvi nAchiyArs
  • uthsavar – bhakthavathsalan with srI dhEvi and bhUmi dhEvi nAchiyArs
  • mai niRak kadal (blackish ocean – filled with compassion) – another uthsavar inside the garbagruham
• thanikkOyil nAchiyArs (separate thAyAr sannidhis)
  • abhishEka valli thAyAr (kaNNa mangai thAyAr)
  • ANdAL
• srI rAma (kOdhaNda rAmar) parivAr – mUlavar/uthsavar
• krishNa, rukmiNi, sathyabhAmA
• hayagrIvar (inside vEdhAnthAchAryar)
• garudAzhwAr
• sEnai mudhaliyAr
• AzhwArs
• thirukkaNNamangai ANdAn
• vEdhAnthAchAryar
• maNavALa mAmunigaL

Outside the temple:

• srInivAsar with srI dhEvi, bhU dhEvi thAyArs (separate temple)
• thiruvadi (hanumAn) sannidhi
• emperumAnAr (separate temple)

uthsavams

• chithrai
  • brahmOthsavam – 10 days – 9th day paurNami thiru thEr (rathOthsavam) and thIrthavAri, 10th day – sapthAvaraNam
• vaikAsi
  • visAgam – thirukkalyANam for perumAL/thAyAr
• Ani
  • sravaNam – thirukkaNNamangai ANdAn thirunakshathram
• Adi
  • Adi garudOthsavam
• AvaNi
  • srI jayanthi – rOhiNi/ashtami followed by uRiyadi uthsavam on the next day
• purattAsi
  • navarAthri uthsavam – 9 days with golu
  • vijaya dhasami
  • vEdhAnthAchAryar uthsavam – 10 days completing on sravaNam
• aippasi
  • maNavALa mAmunigaL uthsavam – 10 days completing on thirumUlam
  • dhIpAvaLi
  • pavithrOthsavam
• kArthigai
  • kArthigai dhIpam
• mArgazhi
  • dhanur/mArgazhi mAsam kramam
  • adhyayana uthsavam
  • vaikuNta EkAdhasi (rA pathu beginning)
• thai
  • sankarAnthi
• mAsi
  • magam – garuda sEvai
• panguni

Thanks to chakkaravarthi swamy for providing the details.