Question: On what date did the riots that Bob Kohler was a veteran of take place?

Context paragraphs:
Teknival: Teknivals (the word is a portmanteau of the words tekno and festival) are large free parties which take place worldwide.  They take place most often in Europe and are often illegal under various national or regional laws.  They vary in size from dozens to thousands of people, depending on factors such as accessibility, reputation, weather, and law enforcement.  The parties often take place in venues far away from residential areas such as squatted warehouses, empty military bases, beaches, forests or fields.  The teknival phenomenon is a grassroots movement which has grown out of the rave, UK traveller and Burning Man scenes and spawned an entire subculture.  Summer is the usual season for teknivals.

Bob Kohler: Robert Andrew "Bob" Kohler (17 May 1926 – 5 December 2007) was a gay rights pioneer.  A native of Queens, New York, Kohler was a lifetime activist in New York City, who also fought for the rights of many other people and animals.  He was at the Stonewall riots, and considered a father figure to many of the young trans people, such as Sylvia Rivera and Marsha P. Johnson, as well as to younger generations of activists.

Haitian presidential election, 2015: Presidential elections were held in Haiti on 25 October 2015, alongside local elections and the second round of the legislative elections.  Incumbent President Michel Martelly was constitutionally barred from running.  As no candidate received a majority of the vote in the first round, a runoff was to be held on 27 December 2015.  Voter turnout was reportedly 28.8%.  On 22 December the Conseil Electoral Provisoire announced that the runoff has been postponed indefinitely.  However, on 1 January 2016 President Michel Martelly announced that the runoff would be held on 17 January, but on 7 January the President changed the date to 24 January.  On 20 January, Jude Célestin issued a statement that calls "whatever the person who will participate in this January 24 [runoff], is a traitor to the Nation".  Because of rioting and electoral violence, on 22 January the CEP decided to postpone the second round again, with no specific date given, even after President Michel Martelly confirmed the previous day in a nationwide speech that the election should still take place.  The run-off date was later agreed to take place on 24 April 2016.  However, according to Reuters and several other sources, the runoff is postponed again with an indeterminate date most likely after October 2016.  United Nations Secretary-General has expressed deep concern that the agreed upon date for holding elections in Haiti was not met and that no alternate electoral calendar was announced.

Next Croatian presidential election: The next elections for the President of Croatia are due to take place by direct popular vote on a date between 21 December 2019 and 20 January 2020, with a second round (if necessary) to take place on a date between 4 January 2020 and 3 February 2020 between the two candidates with the largest number of votes in the first round.  Namely, the Constitution of Croatia states that a presidential election must be held no more than 60 days and no less than 30 days before the expiration of the incumbent president's term.  They will be the seventh presidential elections since the first direct ones were held in 1992.

Peekskill riots: The Peekskill riots were anti-communist riots with anti-black and anti-Semitic undertones that took place at Cortlandt Manor, Westchester County, New York, in 1949.  The catalyst for the rioting was an announced concert by black singer Paul Robeson, who was well known for his strong pro-trade union stance, civil rights activism, communist affiliations, and anti-colonialism.  The concert, organized as a benefit for the Civil Rights Congress, was scheduled to take place on August 27 in Lakeland Acres, just north of Peekskill.

Cairo fire: The Cairo fire (Arabic: حريق القاهرة‎ ‎ ), also known as Black Saturday, was a series of riots that took place on 26 January 1952, marked by the burning and looting of some 750 buildings —retail shops, cafes, cinemas, hotels, restaurants, theatres, nightclubs and the country's Opera House— in Downtown Cairo.  The direct trigger of the riots was the killing by British occupation troops of 50 Egyptian auxiliary policemen in the city of Ismaïlia in a one-sided battle a day earlier.  The spontaneous anti-British protests that followed these deaths were quickly seized upon by organized elements in the crowd, who burned and ransacked large sectors of Cairo amidst the unexplained absence of security forces.  The fire is thought by some to have signalled the end of the Kingdom of Egypt.  The perpetrators of the Cairo Fire remain unknown to this day, and the truth about this important event in modern Egyptian history has yet to be established.  The disorder that befell Cairo during the 1952 fire has recently been compared to the chaos that followed the anti-government protests of 28 January 2011, which saw genuine demonstrations take place amidst massive arson and looting, an inexplicable withdrawal of the police and organized prison-breaking.

Aniversario: Never Compromise: Aniversario: Never Compromise was a professional wrestling internet pay-per-view (iPPV) event produced by the Chikara promotion, that took place on June 2, 2013, at the Trocadero Theatre in Philadelphia, Pennsylvania.  The event marked Chikara's fourth iPPV, third to take place at the Trocadero Theatre and the promotion's only event to take place in Philadelphia in 2013.  Much like the previous iPPV, Under the Hood, Aniversario: Never Compromise also aired through Smart Mark Video.  Aniversario: Never Compromise celebrated Chikara's eleventh anniversary and was the first anniversary event to take place on iPPV; in the past, the promotion had celebrated its anniversaries with weekends of two shows.  The event saw all three Chikara championships being defended with one title change, where Pieces of Hate (Jigsaw and The Shard) defeated 3.0 (Scott Parker and Shane Matthews) for the Campeonatos de Parejas.  Another major match during the event saw former Campeones de Parejas, Amasis and Ophidian, end their nineteen-month storyline rivalry in a Sarcophagus match.  The event concluded with a major storyline development, where Chikara's authority figure Wink Vavasseur ended the event and shut down the promotion, while the main event was still going on in the ring, leading to the promotion going inactive for a full year.

Stonewall riots: The Stonewall riots (also referred to as the Stonewall uprising or the Stonewall rebellion) were a series of spontaneous, violent demonstrations by members of the gay (LGBT) community against a police raid that took place in the early morning hours of June 28, 1969, at the Stonewall Inn in the Greenwich Village neighborhood of Manhattan, New York City.  They are widely considered to constitute the most important event leading to the gay liberation movement and the modern fight for LGBT rights in the United States.

Lindenstraße: Lindenstraße (literally "Lime Street") is a German television drama series, broadcast by Das Erste.  The first episode aired on 8 December 1985 and since then new episodes have aired weekly.  Its current timeslot on Das Erste is Sundays at 18:50.  The events of the Sunday episode usually take place on the Thursday before the show, based on the TV station's original plan of airing the episodes Thursday night.  Prior of the start of the show, the timeslot was switched to Sunday evening but the Thursday remained the day the events usually take place as the show shall feature the daily life routine of the protagonists on a working day.  Exceptions are the so-called holiday episodes that take place on Sunday, such as for Christmas and Easter and also on important election days (especially the election to the German Bundestag).

Fed Up Queers: Fed Up Queers, or FUQ, was a queer activist direct action group that began in New York City.  The group was made up mostly of lesbians such as Jennifer Flynn (who later co-founded the New York City AIDS Housing Network as well as Health GAP), though notable participants also included gay rights pioneer and Stonewall riots veteran, Bob Kohler, and writer, Mattilda aka Matt Bernstein Sycamore.  The activists who formed FUQ came together loosely for a few actions in 1998, but the first action attributed to Fed Up Queers was on World AIDS Day, December 1, 1998, when they visited New York State Assemblywoman Nettie Mayersohn's house in Queens at midnight to protest her stance on names reporting.

Supporting paragraphs: Fed Up Queers Stonewall riots
Answer: June 28, 1969