[sneakypete]

The Red Mass is celebrated each year for those in the legal profession including judges and attorneys.

Seriously? Is it supposed to somehow absolve them of all the legal and moral wrongdoing they have done all year?

[history_matters]

No, just to invoke God's blessing and guidance upon their work. Some need exorcisms rather than blessings IMO.... but never mind ....

[Mike Fieschko]

Is it supposed to somehow absolve them of all the legal and moral wrongdoing they have done all year?

No.

A Mass never does that, for anyone or any mortal/grave sin.

Only individual confession for each person would do that, provided all the requirements for a confession are present (genuine contrition, firm purpose of amendment, etc.).