In reply to team fat belly:
When we did Alpamayo about 6 years ago we spent a few days in Huarez with some higher local day treks to places like Laguna Churup. Following that we climbed Ishinca, and a couple of days later, Tocllaraju which is actually higher than Alpamayo and a far more interesting mountain than the popular Urus nearby. By the time we got to Alpamayo was well acclimatised.
Alpamayo and the glacier camp are ace, just jaw droppingly beautiful. Just make sure you get on the route (French Direct?) nice and early - wouldn’t want to be stuck behind a slower party on the narrow snow and ice flutings being showered with chunks of ice from high above.