This festival is mentioned on p52 of Distant Shores, and p32 of Faiths of Golarion directs the reader to the Distant Shores reference.
The Festival of Flowers is a 2-week-long party [...] starts on the evening of the waxing half moon that occurs closest to the spring equinox, and concludes on the morning after the full moon.
I'm confused how this can be two weeks long? It's basically 2 weeks from the new moon to the full moon, and only one week from the half moon to the full moon. I can't see how it can be longer than 8 days, allowing for the morning after the full moon.
Can someone tell me what I'm missing?