Mmdky.

 Mangalasasanamu from China Jeeyar tridandi swamiji. 

One of the best explanations I have come across till date. So humbly presented in easily understood language . His magnanimity speaks volumes through his works. One example. Below:

MANI MA:DA KO:YIL

THIRUNA:NGU:R

11 Rudras did penance in 11 places for Lord Sriyahpathi,s grace. God appeared in 11 separate forms to bless each one of them. These 11 places are called Thiruna:ngu:r Divya De:Sam's. This place is famous for the 11 Garuda Se:va festival.

Mani Ma:da Ko:yil is the central point of these 11 Divya De:shams. For the sake of a Rudra named Sri Ma:thangi:swara, Lord appeared as Nara Na:ra:Yana Perumal along with Bhu: Devi and Pundari:ka Valli to please devotees. Hence,he is known as 'Nanda Vilakku Peruma:l.'

Due to Durva:sa's curse, Indra was expelled from the heavens. He did penance at this divya desham and reclaimed his position.

The new moon day after Makara Sankra:thi is named "Thai Ama:va:sya " on that day, Thirumangai A:lwar invites Perumal:I from these 11 Divya De:Sam's and offers mangala:sa: sanams. Later,all these deities, mounted on their respective Garuda, offer mangala:sa:sanams to Tirumangai A:Iva:r, who is riding on Hamsa Va:hanam.

This spectacular Garuda festival concludes with Thirumangai A:Iwa:r returning to Thiruna:ngu:r bidding farewell to everyone, as they depart to their own abodes 

o:m divya manima:da Pura va:sa:ya pundari:ka valli: same:tha:ya nanda:pradi:pa bhagavathe: namaha.