“Summer nights and ballpark lights” is a summer saying that has been printed on many images. “Summer nights and ballpark lights” was posted on Twitter  by nīck® on May 14, 2012. The saying became popular in 2017, when it was printed on gift items.
 
“Summer nights and bonfire lights” is a similar saying.
   
   
Twitter 
nīck®
@nick_p2
«@true_ballplayer Summer nights and ballpark lights. #SoClose»
8:27 PM - 14 May 2012
     
Twitter
Nicholas Ryan
@Nicky_Ry24
Summer nights under ballpark lights. #SoClose\
8:40 PM - 14 May 2012
     
Twitter
Thomas Garrity
@thomasgarrity11
Summer nights and ballpark lights. #baseballlife
1:18 PM - 26 May 2012
     
Twitter
Niko
@EricNikolaisen
Summer nights and ballpark lights. #bleedred @Cardinals
7:27 PM - 6 May 2015
 
Facebook
Live Love Gameday
April 27, 2017 ·
SUMMER NIGHTS & BALLPARK LIGHTS! The words on this tee and the vintage baseball period just make you want to be underneath the stars on a beautiful summer night, watching the best sport ever!
⚾️⚾️⚾️

HURRY & GRAB ONE: https://www.livelovegameday.com/new-arrival/
   
Twitter
Live Love Gameday®
@LiveLoveGameday
Y’all asked, we listened! Our best-selling design is available on a tank. SUMMER NIGHTS & BALLPARK LIGHTS!
⚾️
SHOP: https://www.livelovegameday.com/baseball/
4:26 PM - 11 May 2017
   
Twitter   
Shiirts
@shiirts
Summer Nights & Ballpark Lights Shirt – Funny Baseball Quote https://shiirts.com/shop/funny-t-shirts/summer-nights-ballpark-lights-shirt-funny-baseball-quote/ …
12:50 PM - 2 May 2018
 
Twitter
Mackenzie Hawkins
@cknhwk_jr
I’m ready for summer nights and ballpark lights ❤️⚾️
3:40 AM - 6 Apr 2019
 
Twitter
Carolyn Ryan
@CarolynRyanTV
Throwing back to opening week ⚾️ when the Braves swept the Cubs 💯 Can’t wait for all those summer nights & ballpark lights 🙌🏻
#braves #baseball #homeopener #tbt #atlanta #hometeam… https://www.instagram.com/p/BwIUgoTAeft/?utm_source=ig_twitter_share&igshid=1rt82oh5qjftc …
5:16 PM - 11 Apr 2019 from Georgia, USA