This can be easily fixed by swapping the quotation styles for one of the lines in the plugin's .php file. Open plugins/serendipity_event_geourl/serendipity_event_geourl.php and change...
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print " <meta name='DC.title' content='".$serendipity['blogTitle']."'><!-- generated by geourl plugin -->\n";
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print ' <meta name="DC.title" content="'.$serendipity['blogTitle'].'"><!-- generated by geourl plugin -->';