If you operate a nightclub, restaurant or cybercafe, chances are that you have a ton of excess unused capacity on the times when you're not open.
Most hotels have a sales staff.
In a smaller operation, it might be an employee or department head who sells part time on a commission. Take your lead from them. Designate someone on staff to be the Director of Sales or Sales Manager. This person might be a manager or an employee who has a sales of marketing background. Break each day down into day parts, morning, afternoon, early evening.