editing condtional formating rules to change IF "xxx" apears

Hallo all... pls assist

Have set up an roaming calander that is conditional formatted to colour the dates between the start and end date in "blue" from data sheet. If "jabb" appears in the next row i want the rule of the colum above "jabb row" to change to clear "no fill" as if a space was made for the jabb.

Please see attached.