If you need to group specific types of events together, that could be accomplished using categories. Then you could use the filter or the showCat variable to display only the categories needed on a particular page.
1) Assign each "group" a category (or sub-category).
2) Enter events and assign that event to the category (the group) that should see that event.
3) Design a page to view the calendar for that group.
4) In the code before require("calendar..."), add $showCat="X"; where X is the category number to show. You can determine the category number by using the Event Manager. Click Find/Filter then Advanced. Check the box that corresponds to the "group" and click go. Next, click Find/Filter then Advanced and you'll see the filter name and a number in the yellow box. This is the number to use.