var loadPartyCallback = function(b) {
    return function() {
        return b;
    };
};

var populateMap = function(parties, pinActive, pin) {
    var pinItems = [];
    for (var i = 0; i < parties.length; i++) {
        google.maps.event.addListener(partyMarker, 'click', loadPartyCallback(b));
        pinItems.push(partyMarker);
    }
};