Attention! Students ! Beach party comes ! We are going to have an outdoor party at the National Park on July 15. Activities: 1. Ride bikes from the Student Center to the beach. 2. A picnic on the beach. 3. Swimming and sailing contests.  What to bring: sun cream, sunglasses, hats, swimsuits, hiking shoes and personal items. Deadline for signing up : Sunday, July 8 Fee: 200 per person. Meet at the Student Center at 10:00 am, July 15 P. S:All the food will be offered by the Students' Union. What's the main purpose   of the poster?
To tell students what to do in the summer. To teach students how to plan a party. To make money for National Park. To get more students to join the activities if possible.