Here’s a nifty Google Calendar trick I recently learned. Aside from using the tabs above the calendar view to change the view (month, week, day, next 4 days, agenda), you can also use your mouse cursor to drag and drop to select days in the mini-calendar to the left of the main view.
So for instance, I want to select April 2nd, 3rd and 4th, I just click and drag from 2 to 4 on the mini calendar. The main view will then add days according to the current selection in the mini calendar.
If I want to select two whole weeks, say from March 4th to 17th, I just drag from 4th to 17th, and the main view will display those whole two weeks.
Now if I want to select another two-week period, I just click on any date that falls on the first week of my new selection. Google calendar will now show me those two weeks. The same goes with any selection. If I’m in a one-day view, clicking on any other day will display the events for that day alone. If I’m on a three-day view (like with the first example), clicking on any other date will display the events for three days, starting with the date I clicked.