How to handle multiple spring requests concurrently but sequential execution of events

I am having few endpoints in spring controller, who do the job of updating the event related data on the basis of eventId.

@PostMapping
public void updateNameOfEvent(String eventBody){
   // fetch the eventId from the eventBody
   // update the name of event in database and return the success response
}

@PostMapping
public void updateDetailsOfEvent(String eventBody){
   // fetch the eventId from the eventBody
   // update the details of event in database and return the success response
}

There could be a lots of eventId for which we can get the updates, but the sequence is affects a lot here, because whatever updates will come those will be in sequence order.

what I can do in order to achieve concurrency with sequential execution of events ?

what I can think of is as below, but need some suggestions on the same, if it's correct.

1. Can create the multiple threads and divert the request on a basis of eventId hashkey. i.e. hash value with x amount will be forwarded to Thread A, and same goes to others eventId hashkey.(so here I will create the threads with the help of ThreadExecutor)
2. Spring channel through which can create multiple channels and divert the request on basis of hash value of eventId.

So is Idea which I am proposing would be fruitful ? Also do I have any better and simpler approach apart from the above one ?