Padhinettaam Peru
Good recipe website - subbu's kitchenToday is Padhinettaam Peru, or as some people call it Aadi perukku - the 18th day of the Tamizh month of Aadi (mid july - mid aug in the Julian Calendar). On the average year, this is a typical spring day. This is celebrated as a Spring Harvest Holiday. This is not a typical harvest festival to thank the Gods - that is Pongal (Sankranthi). The ritual in this festival is to make simple mixed rice dishes (such as lemon rice, tamarind rice, etc), take it to a river bank or beach, and have a picnic.
I kid you not, that is the ritual, and people did it a thousand years ago, and still do it. What a beautiful culture that we have.
If you want a detailed description, read the first chapter of Ponniyin Selvan by Kalki Krishnamurthy. The first scene is when the protagonist, Vandhiyathevan rides into the sunset, along the banks of the Veeranarayana Lake, fed by the Ponni river.
If you just want to read an abridged version, here is my PS-Chapter-1 . Read the rest of the abridged volumes here .