“十一”means " first Oct."in this context it means the National Day holiday.because it starts from the first Oct.Usually it last 7 days. "黄金周”means golden week,of course here means the National Day holiday. "刷卡”means the use the credit card "周”means week.“刷卡周”means the week use credit card often. National Day holiday is national holiday so everyone can have it.Usually people don't work and chose to go shopping or have a travel.So for the economic it is the golden week and also the the week use credit card often.

1st Oct is the National Day in China,and the National Day holiday is from 1st to 7th,it is a whole week,so called'黄金周"（golden week）. And on the holiday,people always go shopping,so"刷卡"(credit card) in this week.