Ya gotta do yer homework before you come here.
First, if you want to find out what social activities are going on at the time of your visits, you should contact groups like the American Business Council, British Business Forum, and check out the blogs and Kuwait forums.
If you want to make friends (and don't have the time while you are here), get onto either the online dating/friendship sites (http://www.pof.com/, http://www.friendfinder.com/, http://www.badoo.com/) or any of the social media sites like Facebook or WhatsApp. Remember the days of pen pals? Well, start making some of them in the age of technology so that you can meet up once you get here.
There are a few Facebook groups that might be able to help:
All the new comers Expats who recently moved to kuwait and looking to make friends of both genders.. come join us here and start preparing to say Goodbye to old boring days :)
Have nothing to do? Want to socialize with others? The Grapevine is a site where you can find social groups, events and activities happening around Kuwait. Have an event, activity, or social group you'd like to share? Feel free to send it over.
Yahoo has a directory of groups in Kuwait at dir.groups.yahoo.com/dir/Regional/Countries/Kuwait.