Periya Perumal Perumanar Thiru Nakshatram is the Periya Perumal Janma Nakshatrotsavam (Periya Perumal Thiruvaradhana).
Periya Perumal is none other than Sri Ranganathar Swamy of Srirangam Temple.
In 2015, Periya Perumal Thiru Nakshatram date is 22 March. This year, it falls in Meena Masam (Panguni Masam).
In 2014, Periya Perumal Thiru Nakshatram date was 28 April. This year, it falls in Mesha Masam (Chithirai Masam).
Panguni Masam (Meena Masam) & Chithirai Masam (Mesha Masam) coincide with Phalgun Month & Chaitra Month in other Hindu calendars.