It is unlikely that you will be approached or harassed if you're in the company of other people. Consider wearing a wedding ring, if you don't already. There is power in vocal embarrassment. Many men are shamed by a verbal, loud woman admonishing them in public. Practice screaming before you leave home! Also shame them by shaking your finger in their faces. Even if the crowd doesn't understand your words, they will understand your indignation and gestures. Most sleazy mend not want public attention. Ask for help or company if you feel uncomfortable. It is common for a would-be thief to use razor blades to cut purse straps, take the purse, and then get away in a thick sea of bodies