Qixi Festival 2019 falls on August 7. BJMTR held a volunteering activity with the theme of "Exchange of Love" at Beijing Zoo station of Line 4, to provide convenient travel services for passengers during summer travel season and to send Qixi blessings. During summer travel season, as the number of tourist significantly increases, Beijing Zoo Station on Line 4 becomes one of the most heavily crowded stations. In order to aid passengers' travel, BJMTR invites more than 20 passengers to experience the work of the station staff by doing volunteering services.