In reply to tingle:
As nothing is likely to be in nick, I would stick to the ridges. Bristly ridge. crib Goch north ridge is quiet until it meets the east ridge. Parsons arĂȘte is good, as is cneifon arĂȘte (not sure or your ability so you might not want to solo this).
Cwm Glas would be a nice place to bivvy.