He may hope you will volunteer to organise it. If you have the time and energy, I say do it! It will be a buzz for you, and great for the parish to have something like that as part of its life.
Well, I would, except ...
My daughter is a historian, and in my first year at the church the Vicar asked her to research the history of the church for an open church event. She spent some weeks doing this, and put a lot of her own time and effort into research and preparing a presentation.
The week before this was to happen one of the Alpha Ladies (nothing to do with the course; the Ladies Who Own The Church) spoke to me before the service. She was not happy, nor polite. She said she understood my daughter was preparing some information for the open event, and complained that nobody had told her. Then lots of complaints about the Vicar never telling anyone anything, then more complaints. She had spent weeks preparing for the open day, she said. I stood there and just looked at her.
When she eventually ran out of complaints I said this; 'What exactly would you like from my daughter?'
She said that my daughter could put a pamphlet on the notice board on the OUTSIDE of the church, in the porch 'if she really wanted to.'
All of this is normal enough. What is not so good is that the Vicar shrugged his shoulders and did nothing at all about it. He allowed me and my daughter to be trampled by the Alpha Ladies, and they knew it.
My daughter of course did nothing at all for the open day, and has never been back to the church since then. I doubt if she ever will.
And I do not take permission from the Vicar to mean anything at all. The Alpha Ladies are in charge.