Let me pose a couple of questions to think through:
What will you do if a potential buyer wants to see the property while you are hosting guests?
What will you do to clean and stage the property between guests for showings?
What will you do if the property is damaged by a guest while you have it on the market?
What if something goes missing and you are both showing the house and you have guests - how will you go about recovering for your losses?
Have you talked to your agent about this? Their liability covereage and your contract with them may be void if you have others through the house outside of their control.