In 1973, Callard moved to New York City and into a raw loft building at 150 Chambers St. Again, Callard found a community of artists including Daisy Youngblood, Joe Haske, Robert Israel and Cara Perlman who lived in the same building and Bernice Rubin who lived in the neighborhood.
Callard's involvement in creating the artist group Collaborative Projects Inc., (known as Colab) was one of her strongest contributions to the New York art community.
In addition, Colab organized several group art exhibitions from 1979 to 1985, and it actively sought to collaborate with other fringe art groups, most notably Fashion Moda in the South Bronx, resulting in what Lucy Lippard called unprecedented and "fragile cross-class, cross cultural alliances".
She made numerous contributions to Colab shows and created many of individual artworks including field recordings, super 8mm films, videos, photographs, drawings, and watercolors.
With Reese Williams, Theresa Hak Kyung Cha, and Mark Thompson, Callard started the LINE organization to raise and distribute money for artists' books.
This desire manifests in her 1980 Site, Cite, Sight show with Bonnie O'Neill in San Francisco, her collaboration with Kathy High on a street poster for Colab, her contributions to Steve Ning's film Freckled Rice and her work with Sam Sue on The Tenement: Place for Survival, Object of Reform in 1988.
They worked with Vince Kennedy as he developed his nontoxic water-based inks for Createx Ltd. From 1985 to 1991, Avocet published 48 editions of screenprints by 33 artists from Colab and the wider artworld, many who have become well known since then.
In 2012, Callard compiled many short films and slide shows to create Talking Landscape, Early Media Work 1974-1984.