How to add tags to select2 JQuery library multiple AJAX

I have some code used to build a multiple select form with Select2.

    $("#city-select").select2({
        placeholder: "Search for a repository",
        minimumInputLength: 2,
        multiple: true,
        ajax: { // instead of writing the function to execute the request we use Select2's convenient helper
            url: "/ajax/citySelect",
            type: 'post',
            dataType: 'json',
            quietMillis: 250,
            data: function (term, page) {
                return {
                    q: term, // search term
                };
            },
            results: function (data, page) { // parse the results into the format expected by Select2.
                // since we are using custom formatting functions we do not need to alter the remote JSON data
                return { results: data };
            },
            cache: true
        },
        dropdownCssClass: "bigdrop", // apply css that makes the dropdown taller
    });

I need to add in a few "tags" progromatically if certain events are triggered. These tags cannot be added during the initialization of the select2 form. I have not been able to find this going through their documentation and other stackoverflow questions.