Appearing of markers with click on another marker

Dear MyMaps Team,

I want to create a map with different markers for each project. With the click on one project-marker, all other project-markers should disappear. Therefore different markers on different locations should appear to mark the involved partners. Furthermore a pop-up Window should appear on one of the markers (the organizer) with detailed information about the project.
Is it possible to implement this? And if yes, how?

Thanks a lot for your help!