That's righchyall

homepage.js

when_the_user_indicates_which_classes_they_wanna_see_homework_for(
	send_user_choice_for_which_classes_they_wanna_see_homework
);

when_the_user_indicates_which_calendars_they_want_to_see(
	send_user_choice_of_which_calendars_they_want_to_see
);


//-----------------Calendar Details-------------------//

function when_the_user_indicates_which_calendars_they_want_to_see( then_do_this ) {
	when_the_user_clicks( '.save-calendars', then_do_this );
}

function send_user_choice_of_which_calendars_they_want_to_see() {
	var what_theyre_choosing = '',
	    what_theyve_chosen;
	
	send_user_choice(
		what_theyre_choosing = 'calendars',
		what_theyve_chosen = calendars_the_user_wants_to_see()
	).done( function( html ) {
			plug_in_the_HTML_of_the_list_of_events_for_the_calendars_user_wants_to_see( html );
	} ).fail( function() {
			ask_the_user_to_refresh_page_and_try_again( '#homepage-calendar-events' );
	} );
}

function calendars_the_user_wants_to_see() {
	return values_of_selected_checkboxes_inside( '.calendarsAsCheckboxes' );
}

function plug_in_the_HTML_of_the_list_of_events_for_the_calendars_user_wants_to_see( html ) {
	jQuery( '#homepage-calendar-events' ).html( html );
}

//-----------------Homework Details-------------------//
function when_the_user_indicates_which_classes_they_wanna_see_homework_for( then_do_this ) {
	when_the_user_clicks( '.save-classes', then_do_this );
}

function send_user_choice_for_which_classes_they_wanna_see_homework() {
	var what_theyre_choosing = '',
	    what_theyve_chosen;
	
	send_user_choice(
		what_theyre_choosing = 'classes-for-homework',
		what_theyve_chosen = classes_for_which_the_user_wants_to_see_homework()
	).done( function( html ) {
			plug_in_the_HTML_of_the_list_of_homework_for_the_selected_classes( html );
	} ).fail( function() {
			ask_the_user_to_refresh_page_and_try_again( '.homework' );
	} );
}

function classes_for_which_the_user_wants_to_see_homework() {
	return values_of_selected_checkboxes_inside( '.classesAsCheckboxes' );
}

function plug_in_the_HTML_of_the_list_of_homework_for_the_selected_classes( html ) {
    jQuery( '.homework' ).html( html );
}

//---------------Shared--------------------//

function when_the_user_clicks( selector_of_clicked_element, then_do_this ) {
	jQuery( function() {
	        jQuery( selector_of_clicked_element ).click( function() {
				then_do_this();
				return false;
	        } );
	});
}

function send_user_choice( what_theyre_choosing, what_theyve_chosen ) {
	return jQuery.ajax( {
		url: WGMC_[ 'site_url' ] + '/remember-user-choice-of/' + what_theyre_choosing + '/',
		data: {
			user_choice: what_theyve_chosen
		}
	} );
}

function ask_the_user_to_refresh_page_and_try_again( element_to_put_message_in ) {
    jQuery( element_to_put_message_in ).html( '<li>Oops! Sarry. Please refresh the page and try again!</li>' );
}

function values_of_selected_checkboxes_inside( checkbox_container_element ) {
	var values_of_selected_checkboxes = [];

	jQuery.each( 
		jQuery( checkbox_container_element + ' input:checked' ),
		function( index, selected_checkbox ) {
			var $selected_checkbox = jQuery( selected_checkbox );
			values_of_selected_checkboxes.push( $selected_checkbox.val() );
		}
	);

	return values_of_selected_checkboxes;
}

remembering-user-choices.php

<?php

send_instructions_to_browser_for_how_to_send_user_choices__wgmc();

enable_receiving_user_choices_from_the_browser__wgmc();

function send_instructions_to_browser_for_how_to_send_user_choices__wgmc() {
	add_action( 'wp_enqueue_scripts', '_send_instructions_to_browser_for_how_to_send_user_choices__wgmc' );
}

function _send_instructions_to_browser_for_how_to_send_user_choices__wgmc() {
	$js_file_path_relative_to_theme_dir = '/js/westgate.js';

	$script_name = 'westgate-js';

	wp_enqueue_script(
		$script_name,
		$location = get_stylesheet_directory_uri() . $js_file_path_relative_to_theme_dir,
		$load_after = array( 'jquery' ),
		$version = $time_of_last_edit_of_js_file = filemtime( get_stylesheet_directory() ) . $js_file_path_relative_to_theme_dir, // This will ensure that the version number is updated every time the file changes. That, in turn, will ensure that the browsers always use the newest code
		$load_in_footer = true
	);

	wp_localize_script(
		$script_name = 'westgate-js',
		$localization_object_name = 'WGMC_',
		$data = array(
			'site_url' => home_url(),
		)
	);
}

function enable_receiving_user_choices_from_the_browser__wgmc() {
	set_up_sessions__wgmc();
	create_user_choice_remembering_url__wgmc();
	handle_user_choice_remembering_url_requests__wgmc();
}

function set_up_sessions__wgmc() {
	session_set_cookie_params( $session_lifetime = YEAR_IN_SECONDS );
	session_start();
}

function create_user_choice_remembering_url__wgmc() {
	add_action( 'init', '_create_user_choice_remembering_url__wgmc' );
}

define( 'USER_CHOICE_REMEMBERING_QUERY_PARAM', 'the-user-is-submitting-choice-for' );

function _create_user_choice_remembering_url__wgmc() {
	add_rewrite_rule(
		$rule = 'remember-user-choice-of/([^/]*)/?',
		$rewrite = 'index.php?' . USER_CHOICE_REMEMBERING_QUERY_PARAM . '=$matches[1]',
		$position = 'top'
	);
	add_rewrite_tag( '%' . USER_CHOICE_REMEMBERING_QUERY_PARAM . '%', '([^&]+)' );
}

function handle_user_choice_remembering_url_requests__wgmc() {
	add_action( 'wp', '_handle_user_choice_remembering_url_requests__wgmc' );
}

function _handle_user_choice_remembering_url_requests__wgmc() {
	global $wp_query;

	if ( $a_user_choice_was_submitted = isset( $wp_query->query_vars[ USER_CHOICE_REMEMBERING_QUERY_PARAM ] ) ) { 
		$what_the_user_is_submitting_choice_for = $wp_query->query_vars[ USER_CHOICE_REMEMBERING_QUERY_PARAM ];

		remember_user_choice__wgmc(
			$what_the_user_is_submitting_choice_for,
			$what_their_choice_was = $_GET[ 'user_choice' ]
		);

		switch( $what_the_user_is_submitting_choice_for ) {
			case 'calendars':
				show_calendar_events( $_GET[ 'user_choice' ] );
			break;
			case 'classes-for-homework':
			default:
				show_homework_posts( $_GET[ 'user_choice' ] );
			break;
		}

		die;
	}
}

function remember_user_choice__wgmc( $what_the_user_is_submitting_choice_for, $what_their_choice_was ) {
	$_SESSION[ $what_the_user_is_submitting_choice_for ] = $what_their_choice_was;
}

function get_user_choice__wgmc( $which_choice ) {
	return isset( $_SESSION[ $which_choice ] ) ? $_SESSION[ $which_choice ] : array();
}