happen, befall, bechance -- (happen, occur, or be the case in the course of events or by chance; "It happens that today is my birthday"; "These things befell" (Santayana))
happen -- (chance to be or do something, without intention or causation; "I happen to have just what you need!")
happen, materialize, materialise -- (come into being; become reality; "Her dream really materialized")
find, happen, chance, bump, encounter -- (come upon, as if by accident; meet with; "We find this idea in Plato"; "I happened upon the most wonderful bakery not very far from here"; "She chanced upon an interesting book in the bookstore the other day")