I think it makes sense to adapt to where you are because it connects you to where you presently live. If you were living Down Under, of course you would shift your Sabbat celebrations to match the seasons in the southern hemisphere. If you are really following the Wheel, then you notice what is going on around you and adapt your observances to what is happening in your surroundings. To do otherwise, would be sort of silly... though there's no reason you can't remember at a certain time of year people are doing this in your homeland while here people do this other thing. You could observe certain traditions as remembrances in that case. However, you will always be you and carry the traditions of your heritage or chosen path with you. So if you come from Celtic lineage, I would expect you to carry on with some of the traditions of that heritage no matter where you are. You are a product of your heritage and your environment. Each place you live will leave a bit of an imprint on you and your practices-- it's the story of you. For that reason, I don't think you have to completely forsake your roots for the traditions of where you live you now. It's like Vordan says of food though you could apply it to a person-- a Chinese person who is raised in America becomes American Chinese. It's not the same as being Chinese and it's not the same as being just American either--it's being a Chinese person who has lived in America. Does that make sense?