It's almost time to Thunder up in Oklahoma City as some of the schedule for the OKC Thunder's first-round playoff series was announced.The Thunder, who are the No. 1 seed in the Western Conference, will open postseason play on Sunday night either against the Sacramento Kings or New Orleans Pelicans. The winner of their Play-In Tournament game on Friday will travel to Oklahoma City for the start of a best-of-seven first-round series.Game 1 is slated for 8:30 p.m. on Sunday, and Game 2 will be at 8:30 p.m. on Wednesday. Both games will be in Oklahoma City before the series shifts to the road. Below is a look at the Thunder's first-round schedule.Game 1: 8:30 p.m. Sunday, April 21, in OKC (TNT)Game 2: 8:30 p.m. Wednesday, April 24, in OKC (TNT)Game 3: 2:30 p.m. Saturday, April 27 (TNT)Game 4: Monday, April 29. Time TBDGame 5 (if necessary): Wednesday, May 1, in OKC. Time TBDGame 6 (if necessary): Friday, May 3. Time TBDGame 7 (if necessary): Sunday, May 5 in OKC. Time TBDIf you couldn't get tickets to either of the first two games, the Thunder have offered a new way to get ready for the playoffs with Thunder UP in the Park.| MORE | Thunder up! OKC transforms into a playoff hub as NBA season heats up"We're going to the No. 1 gathering place in downtown OKC and Scissortail Park. It will be so much fun. People will love it just as much as they love Thunder Alley," Thunder spokesperson Gayle Maxwell said.The playoff pregame event starts three hours before tipoff as Scissortail Park Plaza turns into Thunder UP in the Park, a party for fans with giveaways and other fun activities. Top HeadlinesPiece of 'space junk' from International Space Station hits Florida homeSuspect in death of 2 Kansas women was Cimarron County GOP chair4 suspects accused of murdering missing Kansas women expected in courtOSBI confirms 2 bodies found in Texas County belong to missing mothers. What we knowPonca City police use spike strips to stop 16-year-old suspected car thief