Places that i would suggest for the meet are,
1)Toll Gates(Chennai and Pondicherry),because after crossing both the toll gates,you have some place for halting on the sides.
2)After Mudhaliyarkuppam Boat House(with a sign board stating Marakanam 22 kms),there is a beautiful location
for meets,but the thing is that it would be very very hot because of no shade
.
I would suggest the second choice,as we can park almost 100 cars along the sides as it is a long stretch.
Regarding our lunch,we can have it at any restaurant inside Pondicherry,or else on ECR,there are few sea view resorts with Restaurants attached,we can try there.(I saw them on the billboards today).