Let's say you decide to make plans. The first thing you need to do is adjust your expectations. Cellphones have made plans susceptible to revision at any moment, thus making them in advance is essentially pointless. Futile even. In case you do, let's here's what to expect.
Once your plans have been made, a string of reconfirmations will follow. A reconfirmation is a neurotic reiteration of a plan that's already been confirmed. The purpose of this is to weed out the first few no-shows--people that would have canceled anyway, just later. Also, don't be alarmed if the original plan becomes an entirely #%@*ing new one.
Once it comes time for your plan, we can divide your invitees into three categories. First we have the latecomers, those that despite the remedial time-management skills necessary to arrive on time, are stuck in traffic, still at work, or looking for parking. Second we have the no-shows, those that bail at the last minute and seem unusually eager to reschedule to compensate. Third we have the optimizers. These guys are reluctant to commit because they're still in the process of evaluating if your plan is the best plan. Finally there is potential for a fourth category--those that show up on time--but as our expectation bar indicates, this is unlikely.
Now all of this might seem really rude, annoying, or just plain #%@*y, and that's because it is.