Travelers in Osaka will have troubles because of the preparation of G20 SUMMIT which will be held in Osaka on June 28 and 29. As part of the preparation, all lockers in the railway stations in Osaka prefecture will not be available between June 24-29. It will be difficult for travelers to bring big suitcases during the rainy season. You can use Ecbo Cloak(https://cloak.ecbo.io/en), the company which introduced luggage storage in Japan. Heavy traffic jams are expected nearby big stations like JR Osaka station during the summit. Some sightseeing places such as Osaka castle, Umeda Sky Building and Dotonbori River JAZZ Boat announced that they are closed around the days of G20 SUMMIT. For more information, you may visit the Osaka Convention and Tourism Bureau's website.
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