Actually, good anomaly detection can take into account what "normal" is for your use-case. For example, Facebook Prophet (a forecasting procedure, which can in

Actually, good anomaly detection can take into account what "normal" is for your use-case. For example, Facebook Prophet (a forecasting procedure, which can in turn be used for anomaly detection) has extensive support for seasonalities and holidays, and would probably work well for the use-case you mentioned.