naturalization ceremony and british passport

Hello all
can somebody please advise me on what to do. I just received my approval for my my naturalization application from atlas. The council has booked my ceremony date for 28th of April. But I have booked my holiday for early may 9th of may. I don't think I will have enough time to get my British passport before I travel. Is it possible to change venue for the ceremony to another council. Anybody know the process, Apparently as soon a someone attend ceremony, You are not allowed to travel? until you get your British passport ?. Indefinite leave might be cancel. Anybody has any suggestion?

Change the date of your ceremony until you are back.

Changing council venue is tedious and takes a while.