What are bisexuals taking part in the LGBT pride parade are celebrating?
romantic attraction, sexual attraction, or sexual behavior toward both males and females
Bisexuality
Bisexuality is romantic attraction, sexual attraction, or sexual behavior toward both males and females, or romantic or sexual attraction to people of any sex or gender identity; this latter aspect is sometimes alternatively termed "pansexuality."
Tucson Pride
Tucson Lesbian and Gay Alliance (dba: Tucson Pride) is Arizona's first and oldest LGBT pride organization and one of the oldest LGBT pride organizations in the nation.
 Tucson Pride organizes and promotes the greater Tucson metropolitan areas LGBT pride parade ("Pride on Parade") and pride festival ("Pride in the Desert") which are currently held at the start of October each year in Tucson, Arizona, to celebrate the lesbian, gay, bisexual, and transgender (LGBT) community and their allies.
New York City LGBT Pride March
The annual New York City LGBT Pride March, or New York City Pride March, traverses southward down Fifth Avenue and ends at Greenwich Village in Lower Manhattan.
 The New York City Pride March rivals the Sao Paulo Gay Pride Parade as the largest pride parade in the world, attracting tens of thousands of participants and millions of sidewalk spectators each June.
 The March passes by the site of the Stonewall Inn on Christopher Street, location of the 1969 police raid which launched the modern Gay Rights Movement. Beirut Pride
The Beirut Pride is an annual LGBT pride festival and parade held in Beirut, the capital of Lebanon.
 Its founder is Hadi Damien.
 The inaugural parade is expected to be held on May 21, 2017.
 It was the first LGBT pride parade planned in the Arab World,but were forced to hold a private event due to fear of violence from police and islamists. Chicago Pride Parade
The Chicago Pride Parade, also colloquially (and formerly) called the Chicago Gay Pride Parade or PRIDE Chicago, is the annual pride parade held on the last Sunday of June in Chicago, Illinois in the United States.
 It is considered the culmination of the larger Gay and Lesbian Pride Month, as promulgated by the Chicago City Council and Mayor of Chicago.
 Chicago's Pride Parade is one of the largest, by attendance, in the world. São Paulo Gay Pride Parade
São Paulo LGBT Pride Parade (Portuguese: "Parada do Orgulho LGBT de São Paulo" ) is an annual gay pride parade that takes place in Avenida Paulista, in the city of São Paulo, Brazil, since 1997.
 The 2006 parade was considered the biggest pride parade in the world at the time by the Guinness Book of World Records, and it typically rivals the New York City Pride March as the largest pride parade in the world.
 In 2010, the city hall of São Paulo invested R$ 1 million reais in the parade.
 The event is the second largest of the city, after only Formula One.
 According to the LGBT app Grindr, the gay parade of the city was elected the best in the world. San Diego Pride
San Diego Pride, also known as San Diego LGBT Pride, is a nonprofit organization which sponsors an annual three-day celebration in San Diego, California every July, focusing on the lesbian, gay, bisexual and transgender (LGBT) community.
 The event features the Pride Parade on a Saturday, preceded by a block party in the Hillcrest neighborhood the night before, and followed by a two-day Pride Festival on Saturday and Sunday in Balboa Park.
 Pride Weekend is believed to be the largest civic event in the city of San Diego.
 The parade has more than 200 floats and entries and is viewed by a crowd of nearly 200,000 people. Pune Pride
Pune Pride is an annual LGBT pride parade that was first held in Pune, Maharashtra on 11 December 2011.
 It is the second Pride parade to be organized in the state of Maharashtra, after the Mumbai Queer Azaadi Parade. Bączkowski v Poland
Bączkowski and Others v Poland was a European Court of Human Rights case which ruled unanimously that the banning of an LGBT pride parade in Warsaw, locally known as the Parada Równości (equality parade), in 2005 was in violation of Articles 11, 13 and 14 of the European Convention on Human Rights.
 Delivered on May 3, 2007, the ruling was the first which affirmed that banning LGBT pride parades goes against the right to freedom of assembly and association. Baltic Pride
Baltic Pride is an annual LGBT pride parade rotating in turn between the capitals of the Baltic states; Tallinn, Riga and Vilnius.
 It is held in support of raising issues of tolerance and the rights of LGBT community and is supported by ILGA-Europe.
 Since 2009 the main organisers have been Mozaīka, the National LGBT Rights Organization LGL Lithuanian Gay League, and the Estonian LGBT Association.