Summer festival (Matsuri) in Kansai

Gion Matsuri 7/1-7/31 (main festival period is 7/14-7/16, 7/17)
Shijyo/Karasuma, Kawaramachi, Gion-shijyo station

To learn about Gion Matsuri
http://www.japan-guide.com/e/e3942.html 


Tenjin Matsuri 7/24 & 7/25 (The fire works on 7/25 night 7pm-9pm.)

Tenmabashi, Sakuranomiya, Minamimorimachi station (These are very crowded stations but close to the fire works.)
Osakajo-kitazume, Kyobashi, Osakajo-koen station (These are less crowded but a little distanｔ from the fire works location. )

To learn about Tenjin Matsuri
http://www.jnto.go.jp/eng/location/spot/festival/tenjinmatsuri.html
http://www.tenjinmatsuri.com/tenjinmatsuri_navi



Both are very famous and popular festivals so it will be very crowded. Don't forget to bring water with you and watch your luggage.  Make sure you don't get seperated from your children.