>>There is an event object in MM's that is meant for this type of thing (eg. when you have a process that requires a number of bizobjs to complete it's task).
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>I know about Event object, but in my case I want to use some methods and properties of Calendar object inside the "main" biz object. Would Event object still work for me?

Yes, but I guess this really depends on how you are classifying what you are doing. If you're do some process that requires the interaction of a couple of bizobjs, then use the event class. If you are just doing something specific to a single bizobj that happens to require one or two other bizobjs, I would just instanciate them inside of my method(s) where I need them. If there is more than one method, then I prefer to create properties for each bizobj and create the references in the PostInitHook() (and add code to clear the references in the Destroy, eg. This.oMyBizObj = .NULL.).