Dear Tanveer,
If you look at it from the forum point of view, PG connect gives u an opportunity to know people who are in the same slot as yours. But, if there is a thread for each institute, each day, each time slot, won't it be really messy on the forums? Think about it!
I would advise,
(a) Go through PG Connect and list down the 3-4 or more PGites, that are slotted for GDPI on the same day / time slot as yours.
(b) Use PM to contact them, and get to know each other.
(c) If possible, have a small PG Meet on that day.
(d) Give us feedback about the swell time u guys had cornering others in the GDs!
Alohaa.. All the best!!