The event organiser, Stromness Museum, has the legal responsibility to tell ticket buyers and event attendees how their personal information will be collected and used. You can find their Privacy Policy below or contact them to request it.
The Museum's privacy policy and what information we retain can be viewed here: https://stromnessmuseum.org.uk/sites/stromnessmuseum.org.uk/files/downloads/SM%20data%20protection%20policy.pdf