Careers orientation rarely fails on goodwill. It fails on logistics.
A day on which young people visit companies sounds like an appointment. It is really a matching problem with many parties: employers register which occupations they will show and how many places they have. Schools register classes. Teachers need an overview of who goes where. Young people want to find something that interests them, not whatever is left over.
As long as that runs on lists, email and callbacks, the effort grows with every additional employer and every additional school, capping exactly the thing that is supposed to grow. For two cities at once it cannot be done by hand at all.