U.S. stocks may extend their rally into the coming week, with investors encouraged by euro-zone efforts to stem the region‘s debt crisis, but gains are far from a sure thing as Federal Reserve and International Monetary Fund policymakers meet.

Then again, there may be news that blows that theory right out of the water. That is simply the market environment that we are now dealing with.

The two-day gathering of the Fed‘s Federal Open Market Committee ends Wednesday and the IMF/World Bank gathering includes a speech by Greek Prime Minister George Papandreou in Washington Tuesday.(Update – Papandreou’s visit that was just cancelled)

Also on the docket next week are earnings from Oracle Corp., Adobe Systems Inc. ADBE and Nike Inc., and U.S. economic data include housing starts and existing home sales.

All from MarketWatch…