Importing a calendar from another app / platform

We are currently using a platform that is focused on managing contacts and contracts regarding sales. A feature allowing to import a calendar (among other data) generated from this platform and add it into Master tour as a continuity: once the info is available, we build the actual tour in Master tour (the same thing would apply for updates from the sales team), would be very useful because we are trying to integrate every aspect of our tours and not having to add every bit manually into Master tour would be a MUST.