proposal, plan document

I write it.

私は書きます

I write the proposal for the event.

私は行事の企画案を書きます

I write the proposal for the event at the library.

私は図書館で行事の企画案を書きます

I write the proposal for the event at the library on the closed day.

私は休館日に図書館で行事の企画案を書きます

I write the proposal for the event at the library with the librarian on the closed day.

私は司書と休館日に図書館で行事の企画案を書きます