going (or go?) on par with that

[Grayarea]

Is the sentence in blue correct grammatically? Do you think that it should be "go on par with that"? Because we should use "do" after "make", am I correct?

This is from an American TV program,

Karl: Oh. So you were jealous?
Susan: No! No! It's just... we were married. And...and she's trying to make this tawdry little affair you guys have going on par with that. It's just... I got mad.

[Bennevis]

Is the sentence in blue correct grammatically? Do you think that it should be "go on par with that"? Because we should use "do" after "make", am I correct?

This is from an American TV program,

Karl: Oh. So you were jealous?
Susan: No! No! It's just... we were married. And...and she's trying to make this tawdry little affair you guys have going on par with that. It's just... I got mad.

That's quite acceptable.

Q: What do they have?
A: An affair.
Q: What kind of affair?
A: A tawdry little affair going on par with something else.

They have an affair that is going on par with something else.

[Raymott]

Is the sentence in blue correct grammatically? Do you think that it should be "go on par with that"? Because we should use "do" after "make", am I correct?

This is from an American TV program,

Karl: Oh. So you were jealous?
Susan: No! No! It's just... we were married. And...and she's trying to make this tawdry little affair you guys have going on par with that. It's just... I got mad.

No, 'going' belongs to 'affair'. "They have an affair going [on] which she is trying to put (or 'make') on par with a real marriage."
The 'on' could belong to either "going on" or "on a par".

What's going on here?
We're having an affair.
They are having an affair going on, or they have an affair going.

[Bennevis]

The 'on' could belong to either "going on" or "on a par".

Raymott,

doesn't on here belong to on a par only?

[SoothingDave]

Raymott,

doesn't on here belong to on a par only?

I don't read it that way. The affair is going on. She is trying to make it par with "that."

It's not particularly well written.

[emsr2d2]

Is the sentence in blue correct grammatically? Do you think that it should be "go on par with that"? Because we should use "do" after "make", am I correct?

This is from an American TV program,

Karl: Oh. So you were jealous?
Susan: No! No! It's just... we were married. And...and she's trying to make this tawdry little affair you guys have going on par with that. It's just... I got mad.

I agree that it's not very well written. As far as I'm concerned, there would have to be two "on"s - one for "going on" and one for "on [a] par with".

She's trying to make this tawdry little affair you guys have going on on a par with that.

By the way, are you sure that's from an American TV program? I only ask because Karl and Susan are a couple (surname Kennedy) in "Neighbours", and those two lines sound entirely as if they could be from a storyline which involved them. "Neighbours" is Australian.