I'd be checking with people over how likely they are to come to you before you decide anything definite. If there are very few people willing to travel to you then it may just well be decision made.

Otherwise - you need to decide what's more important to you. To be able to see everyone for the occasion, or to have the occasion in your own surroundings? To have friends there, or family?

Or perhaps a compromise, Sydney for Nate's christening and home for DH's party, but that does mean two separate weekends, I guess.

BW