June is the equivalent of the gay Christmas season. It marks Pride month, the celebration of the diversity of sexual preferences and gender identities.
It is a time to remind the world that people of all kinds exist. To achieve this, many more pride parades across the planet occur during that time and many people display their pride flags at their windows. (Check which are your flags here). Also, many companies switch their colors to the famous rainbow to show their support.
Happy Pride Month!