temporarily forbid
... that local concert promoters sometimes temporarily forbid music acts from performing in nearby cities to protect ticket sales?
... that local <a href="./Tour_promoter" id="mwAXU" rel="mw:WikiLink" title="Tour promoter">concert promoters</a> sometimes <b id="mwAXY"><a href="./Radius_clause" id="mwAXc" rel="mw:WikiLink" title="Radius clause">temporarily forbid</a></b> music acts from performing in nearby cities to protect ticket sales?