Do we say "I'm going to/for mass"

[Hardwork]

1) Do we say "I'm going to mass" or "I'm going for the mass" ( I mean mass at chruch)
2) Also do we add "the" before mass:
eg Do we say "I'm at mass" or " I'm at the mass"

[Beeesneees]

In most cases:
I'm going to mass.
I'm at mass.

Adding 'the' indicates one particular service, for example:
"Are you going to mass this Sunday?"
"Are you going to the mass which is being held to celebrate the church's anniversary?"
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Cheers m' dears!

[Haihao]

I'd prefer 'Mass'.

[Hardwork]

[Beeesneees]

You can. Notice I said "In most cases" - there is a personal choice involved. I'm just explaining what seems to be most common.
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Cheers m' dears!