Display all 4 IPs in a Timeslot as a single Block in the public schedule.
the public schedule (matrix view by days and rooms) should show in a given room/time slot a single block consisting of all 4 IPs in the slot, with IP title (30 characters max) and names of speakers (author and a paid co-author). clicking on the titles and and names should open detailed information about event or all 4 events (whichever is possible).