This coming April 10 to 12 at The Theatre at Solaire, Ballet Philippines stages the end of its “56th season with Paglalakbay: The Journey of the Sea People.” It is a full-length original Filipino ballet inspired by the Austronesian migration, often called the Austronesian Expansion — one of the largest and most significant migrations in human history roughly 5,000 to 6,000 years ago.