The first time I went to Wat Phu was a week before the festival. I didn’t get to see much of anything since it was dark by the time I got there. The second time I went to Wat Phu was during the annual festival and also the 5th years anniversary of being named as a world heritage site. It was a wonderful experience for me.
The only bad part was the fact that it was too crowded and noisy. I hope to go back there in the near future during low tourist season. That way I can take my time and examine the magnificent architecture.