In August, 2009, Kalmann joined the ranks of the
Israel Gay Youth (IGY), where he volunteered for five years. He served as a youth counselor for youth groups and as the educational coordinator for the Sharon district counselors. In 2012 and 2013, Kalmann was chosen to lead the
Tel Aviv gay pride parade campaign. As the campaign designer, he created the image "It's Worth Being Proud" ("Let it B") in which the leaders of the gay community in Israel participated. In 2015, Kalmann was elected co-
chairperson of the LGBT Association, together with
Chen Arieli, who is currently serving as the organization's chairperson. At that time, the association led organizational changes and collaborations with other gay organizations in Israel. The association grew tenfold in number of members and increased the community's organizational budget from 1.5 million shekels a year, to 11 million shekels. He decided not to allow
Education Minister Naftali Bennett to speak at
the memorial ceremony for Shira Banki and
the murder victims at the gay center Bar-Noar, because of the minister's refusal to sign a statement of commitment to the rights of the community. Kalmann and Arieli initiated a special day in the
Knesset devoted to
the rights of the gay community in Israel, They also led a protest against the homophobic remarks by Rabbi Yigal Levinstein, which led to the Ministry of Defense prohibiting his entry to IDF bases, a petition to the
Supreme Court of Israel for
gay marriage, petition to the high court for equality in registering children of female couples, and a struggle that led to the Ministry of Health and
Magen David Adom decision allowing homosexuals and bisexuals to
donate blood. In the
run-up to the twentieth Knesset elections, Kalmann was elected to the 17th place by
Meretz on the party's Knesset list. In 2017, he announced his entry into politics and his integration into the leadership of the Meretz party. He was later elected chairperson of the Tel-Aviv branch and declared his candidacy for party chairperson. ==References==