The first opportunity is only for our friends in Lahore - and it's today (10th March 2011).
If a layperson in Lahore happens to be looking towards the northwestern sky at ~07:32pm PST (assuming the sky is clear) today, he/she will see a bright "star" emerge from behind the horizon, rise slowly while brightening rapidly, and at 07:36pm, pass IN FRONT OF THE CRESCENT MOON! The "star" will actually be the ISS.
This transit will only be visible from specific locations in Lahore. Details and maps here: link. You don't need a telescope or even a binocular to see the ISS.
A lunar transit during a visible pass of the International Space Station, the largest artificial satellite, is a rare event for a given location on Earth. Our friends in Lahore are lucky today.
I've attached a map of the path of the ISS from Lahore. Sorry, the ISS will not transit the Moon from Islamabad or even Raiwind, but it will pass close by.
Here's a preview of tonight's transit, although Lahore's pass will be more central (and therefore, if things go right, much more photogenic): link. Although the ISS rises slowly from the horizon and will take about three minutes to complete its pass, the actual transit (passage in front of the Moon) will last a split second.
Shots from another pass, this time with a full Moon:
http://legault.perso.sfr.fr/<wbr>eclipse101221_lunar_transit.<wbr>html
And another one during a solar eclipse!
Thierry Legault - Partial solar eclipse and transit of the Space Station from Oman
Good luck.