Cleveland is one of the worse crime-cities in the country.
This has been explained earlier on the thread. Cleveland will be one of the SAFEST places to have the convention! "Downtown" with the stadiums, convention center, Rock Hall, restaurants, hotels, theater district, casino, can be kept secure for a convention. Larger conventions have gotten rave reviews from participants.
Can it handle crowds? Of course. It isn't uncommon for there to be an Indians game, a concert at the Q and plays at the same time.
We're not perfect, but we're not Detroit or Newark. Have you ever been to Cleveland?