I'm probably not able to fund the whole add-on myself. But I don't mind paying for it.
And then the developer can release it to the community for a fair price.
I could just use Doodle, but users have to register to make a new doodle. And that's why the add-on would be useful.
The main reason for this is when people trying to meet each other now they just post when they are available.
But it's a mess and it is impossible to find out when everyone is available. Doodle functionality would make things much easier.