Log Into WIX

Click "Pages" left white column, third icon down. 

Choose Events (under "More" section. - 13th button down.)

Click on Manage Events top left of page

Choose ADD Event top right of page.

Make SURE to choose RSVP. You can not sell tickets even if free without upgrading. The RSVP allows for you to keep track of who participates.

Follow Prompts :)