Christ offered the Last Supper in the evening. Why do you not have Mass in the evening instead of the morning?

It is not essential that Mass should be offered in the evening, but simply that the Mass should be offered. Mass in the evening of course would be quite valid. But the Church, making use of her God-given power to regulate all that pertains to disciplinary matters, has decreed that it should be celebrated in the morning. This law is in honor of the fact that Christ rose from the dead in the early morning, thus completing His work of redemption.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty