Do individuals actively engage with the organisations, or remain passive? Do they leave having begun a relationship with the organisation?
Are you collecting any information that can be linked to an individual? Has the individual given fully informed consent?
Does the interaction make it more likely for individuals to cause offence or break the law?
Does the interaction change based on available staff or volunteers? When might this happen, and what will the consequences be?
Are individuals told what to do? Is it reasonable to expect individuals to follow those rules?
Do individuals create a lot of noise or behave in a way that might interfere with others?
How will changes in the weather affect the interaction?