Refers collectively to Saturdays, Sundays, and national/public holidays; often used on business hours and holiday notices.
この店は土日祝も営業しています。
This shop is open on Saturdays, Sundays, and holidays too.
病院の外来は土日祝は休診の場合が多い。
Outpatient clinics at hospitals are often closed on weekends and holidays.
配達は土日祝を含めて行われますか？
Does delivery take place including weekends and holidays?