After all this time, I have finally figured it out! The calendar works once BlurEmailEngine.apk is added into /system/app/. No more force close issues! I can edit events as well. I have attached the apk in case anyone wants to try it. It can also be found in the removedapps-GB.zip as well (found here: http://www.droidforums.net/forum/apex/145760-rom-apex-v2-0-0-beta-droid-2-5-5-2011-a.html).