The only way I know to sync the calendar wirelessly using the native software is by being on BlackBerry Enterprise Server. Otherwise the calendar is synched via Desktop Manager. Of course, you can do the DM sync via Bluetooth, so that would be wireless. You might also investigate Google Sync.
Google Sync is what I am using. The problem is now when I go to sync my calendar, it only goes one way. I did some more checking in the phone and found that the my calendars do not have wireless synchronization as yes, and switching the no to yes is not an option.