The big opening day of the Encore Boston Harbor, Wynn Resorts big new casino in Massachusetts, is on June 23 and coming fast. Why is it being held on a Sunday you ask? Because Wynn is apparently very worried about traffic being a concern.

The Las Vegas Review-Journal reports the resort has undergone its final checklist by the Massachusetts Gaming Commission (MGC) on June 12, with all of its machines, tables and everything else inspected. Now the focus is on making June 23 go very smoothly, but just getting there might be the hardest part.

Robert DeSalvio, President of the resort, reportedly told the MGC they chose to hold the Grand Opening on a Sunday to avoid congestion on local streets and highways. They’ve also spent $1 million in “transportation marketing and advertising.”

Anyone planning to visit the resort is encouraged not to drive, they say, and they are pushing visitors to use public transportation, bicycles, shuttle busses, harbor shuttles, or to just plain walk.