Guests can contact Event Organisers/Platform using the direct messaging feature called Chat which gives guests a platform for questions, queries and general support.
When logged into the event, the Chat feature can be located on the left sidebar menu of the mobile app:
Messages will then be sent and received in the event chat feature located on the left side menu of the platform:
Adding Chat in the platform
Event Configuration -> Event Brand
Chat can only be displayed in the mobile app when the Chat feature has been added on the platform via app builder. Example below: