This was part I of two lectures on the geometric definition of VOA. We mostly discussed background and motivation
 Sketched G. Segal's definition of CFT.
 Introduced the rigged moduli space of which there are two models: (1) Bordered Riemann surfaces where each boundary component is parametrized by S^1. (1) Punctured Riemann surfaces with local coordinate charts specified in a neighborhood of each puncture.
