i dont give a isht in situations like these
If its a bunch of people who is dropping in just to say hello hi, then it would be nice if they called ahead, but they dont really have to - we are “mashriqui” you know - back home nobody calls before dropping in, and the first time you realize that you have guests is when you are trying to dodge the army of assorted kids, all racing in to the house, MAmoooo Salammmmmmm - and you see a group of adults behind the kids. They have just gotten off the rickshaw or taxi, or car, and didn’t even bother to knock on the door.
Love you Eastern Values 
Just some basic rules, they should not arrive at 11:30 in the night and stay for 5 freaking hours. Nobody is going to disturb his or her schedule or routine, the guests can come in, and they will be attended to, and given all respect- in due time. And they will share whatever daal roti is on the menu for that day.