Dave - where have you been???
WeCool - unfortunately, it is not possible to notify people ahead of time if you are going to be on a cruise with a large group. It is one of the most common complaints in the industry - not that it happens often, but it does a few times per year.
Most groups will not bother you - but there have been instances when certain groups have been known to cause consternation among regular cruisers.
Unfortunately, there is no one place that can tell you what groups you have going on any specific cruise.