Huge night in Cleveland ... with the World Series and the Cleveland Cavs season opener -- but the cops are SUPER PREPARED -- thanks to the Republican National Convention.
We spoke with Cleveland Police Patrolmen's Association President Stephen Loomis -- who says "it'll be all hands on deck" to make sure everyone has a safe and a fun time.
"There's nothing we can't handle," Loomis says ... "We're experienced with big crowds since the RNC and the Cavs championship parade, so we're pretty well-versed now."
"Those events taught us lessons on how to deal with big crowds."
Loomis says the downtown area will be crawling with cops -- including a bunch of undercover officers and bike patrol -- but he's optimistic everything will go smoothly.
"At this point, there's no trouble on the horizon. Hopefully we have a downtown full of happy fans. This is a huge, high-profile night for Cleveland. Anything like this is a potential night for wrongdoers, but we will know about any possible problems before they happen. People talk ... and our intelligence unit will be on top of it.