Click on Tell me more to read about the event, then use the search term below to find out the exact dates and times for the year you’ll be there.
Search term: Art Aquarium Nihonbashi 20XX (the year you plan to go). This exhibition travels around and they don’t put up the information about this year’s Tokyo event until closer to the time it opens, so you may have to check back for detailed info.
Search terms: Art Aquarium Nihonbashi 20XX (the year you plan to go); Sumidagawa Aquarium; Shinagawa Aqua Park
Search term: Tokyo fireworks August
Other events in the month of August that might be worth checking out:
Bon Odori (traditional neighborhood summer circle dancing, with taiko drumming and traditional music)
Asagaya Tanabata Festival
Lanterns on the Sumida River
Lantern parade and Shinto dance at Kameido Tenjin
(You can search for information on these by Googling the names in bold or searching for them on Tokyo Cheapo or TimeOut Tokyo, which I think have the most reliable info for events that change dates from year to year.)
Read a novel set in Tokyo