If paragraph breaks or some other formatting in the 25Live event description is not appearing correctly in published calendars, try changing the Event Detail spud settings in the calendar. If the detail view is in "Enhanced" mode, the 25Live formatting is preserved.
First, go to the Calendar Spuds section of your published calendar:
Then scroll down to the Event Detail View section and click Switch Detail Views:
Finally, select "Event Detail - Enhanced" and click OK.