Ueno Touganeya Hotel

Japanese Iris at Koishikawa Kourakuen
http://www.gotokyo.org/en/kanko/bunkyo/spot/40263.html
Iris Festival :
※koishikawa Kourakuen was constructed inside the Mito Tokugawa family`s palace in the early Edo period. Inside the park , there are a lot of flowers like the plum trees , Sakura , Azalea ,Iris that you can enjoy throughout the year.In 1923 , this park became the special place of scenic beauty and the special historic site of Japan.
Opening hours 9:00 -17:00 (last entry is at 16:30 )

Japanese Iris at Meiji Jingu shrine gardens.
http://www.meijijingu.or.jp/english/nature/2.html
June 8:00 – 17:00 ( June : Sat/Sun until 18:00 )
Place: Meiji shrine Harajuku station (JR Yamanote line) 5 minutes walk
※In 1893, Meiji emperor ordered to plant Hanashobu (Japanese iris for Empress Shoken. Please enjoy more than 1500 plants of Hanashobu and 150 different kinds of them.

Portable shrine festival around Torigoe Jinja shrine
https://www.gotokyo.org/en/spot/EV049/
8th June
From evening - the town of portable shrine parade
9th June
06:30 – the deity will be on the portable shrine.
21:00 – the deity will be put back to Torigoe shrine.
※Torigoe shrine was built in 651year .
Please enjoy the night festival full of lighten up chochins ,which are the Japanese festival lantern and the heaviest portable shrine in Tokyo.
Place: Torigoe shrine 8 minutes walk from Asakusabashi station ( Sobu line )

Sanno Festival at Hie Jinja shrine
https://www.gotokyo.org/en/spot/EV048/
7th June (Fri) : in the daytime - Tea Ceremony
8th June (Sat) : the Koto performance 11:30- / Kendo (Japanese swordsmanship )13:45-
9th June(Sun) : In the day time - Kagura performance.
12th June(Wed) : 12:15 - Mini concert [The song of Japan]
13th June(Thur):
10:00 - 16:00 Kagura performance.
18:30 - Sanno’s chorus and folk dance
14th June(Fri )
11:00 – 15:00 Tea Ceremony
18:30 - Sanno’s chorus and folk dance
18:00 – 20:00 - Kagura performance.
15th June(Sat)
11:00 – 15:00 Tea Ceremony
In the daytime - Sato Kagura
Noon – Sanno’s Japanese drum
18:30 - Sanno’s chorus and folk dance
18:00 – 20:00 - Kagura performance.
16th June(Sun: 11:30 – 16:30 Tea Ceremony / In the daytime - Sato Kagura
Place : Hie Jinja shrine :3 minutes walk from Tameikesanno station
※The Sanno Matsuri (festival ) is one of the three most famous Matsuris (festivals) of Japan along with the Kyoto’s Gion Masturi, and Osaka’s Tenjin Matsuri. The Sanno Matsuri is to celebrate Hie Jinja shrine which is the shrine associated with Edo castle and the Tokugawa family so was celebrated from Edo period. Kagurabayasi which is the musical sound of flute and drum, Sanno drums, tea ceremonies and other activities you can feel the traditional Japanese culture.

For your reference
https://www.gotokyo.org/en/story/guide/june/