As title,
https://www.spgpromos.com/greatweeks/
Register now for SPG® Great Weeks, Grand Weekends. Starting with your second
stay, you’ll earn double Starpoints® on each stay from January 16 through
April 15, 2018, at participating SPG hotels and resorts. Plus, each time an
eligible stay includes a weekend night,* you’ll get a bonus of 500
Starpoints.
简单翻译：
透过连结注册活动，在注册之后可以
a) 在2018/01/16～2018/04/15之间的第二次住宿（stay）开始，可以得到双倍Starpoints
b) 如果住宿包含周末（通常为周五、六，请参阅terms and conditions获得更多讯息）
则可以得到额外的500 Starpoints
注意事项：
非所有饭店均有加入此促销计画，可于以下连结查询参与促销计画的饭店
https://www.spgpromos.com/greatweeks/participating?language=en_US&IM=Q12018_DEF