Plan termination - Term date

Hi, 

A terminating plan the plan sponsor terminated the plan as of 09/05/2021.  All contribution were stopped, the termination activity stated as of the term date were all part status every changed to term in the plan and everyone became 100% vested and also  communication was sent out to the part's about the term part and asking them to take action on their account balance.  The forced distribution is set for Dec-2021, however now they advisor has got back asking with the term date can be changed to a future date 10/15/2021 since they would want to allow contribution for few of they employees.  

Can the term date be changed now and contribution be allowed?  what will be the repercussion.  

We've un-terminated a plan once or twice.  Do a new resolution/consent and say the effective date is changed, and re-communicate.  I don't see how anyone is impacted negatively.

Ok, thank you.