Denver police officers are on hand to try and make sure things go as smoothly as possible.
"In the past we've had some adults who had too much to drink and have become involved in some domestic quarrels or acted inappropriately, but for the most part it's typically peaceful," Commander Tony Lopez with the Denver Police Department said.
A Cinco de Mayo festival is in Civic Center Park and police are expecting around 400 thousand people. On Saturday afternoon, what's being called the biggest derby event outside of the Church Hill Downs in Kentucky was held outside the Colorado Convention Center. Elitch Gardens opened for the season, and the Colorado Rockies are playing at Coors Field.
There is also the annual cruising event on Federal Boulevard for Cinco de Mayo and the Colorado Mammoth have a play-off game at Sports Authority Field at Mile High.
Despite the large crowds pouring into downtown, police say they're ready for any situation.
"So far it has been a great day, but we're prepared to handle any problem that might pop up. We have more than enough officers to man the area and handle things outside the event," Lopez said.
Police say those headed into the downtown area should be prepared for heavy traffic and several road closures. They also recommend people taking the light rail, RTD busses or walking to the events downtown.
"There is affordable parking down here, but there will also be a lot of traffic because all the roads leading to Civic Center Park will be closed and there are several other closures around the downtown area, Lopez said. Traffic will be busy."
Police are also watching for people who drink too much and then get behind the wheel.
(KUSA-TV © 2012 Multimedia Holdings Corporation)