This is usually a problem with very long titles of events. To change that, you will need to decrease the size of the title. in your CSS stylesheet at line 1388 look for
.search header.article-header h1.h2 a { font-weight: bold; color: #333333; font-size:1.3em; text-transform: uppercase; }
change the font-size:1.3em to 1.1em or 1em to fix the problem.