1) All-American attraction 2) Brave undertaking 3) Diamond event 4) Fenway Park action 5) Fenway park event 6) Football tennis 7) Half a doubleheader 8) New ballgame 9) Opening day event 10) Set of circumstances 11) Sight at Fenway Park 12) Situation 13) SkyDome event 14) Sporting event 15) State of affairs 1) Baseball 
new ballgame noun a particular situation that is radically different from the preceding situation; `HDTV looks the same but it`s really a whole new ballgame`