Let’s make it (on) Sunday.

[diamondcutter]

A: The new year is coming. Shall we have a party to celebrate it?
B: Good idea! When will we have it?
C: What about Saturday?
A: Sorry, I’ll go out with my cousin on Saturday.
B: What about Sunday?
A and C: No problem.
B: OK. Let’s make it Sunday.
(By me)

In this context, I’d like to know whether it’s also OK to put the preposition “on” before “Sunday” like this:

Let’s make it on Sunday.

 

[Rover_KE]

No.

 

[jutfrank]

Change the line I'll go out with my cousin on Saturday. You've got the wrong future form there.

Change the modal in the question When will we have it? too.

 

[diamondcutter]

What about this?

1. I'm going out with my cousin on Saturday./I’ll be going out with my cousin on Saturday.

2. When shall we have it?