Event List Razor Macro

@using System;
@using umbraco.MacroEngines;

@inherits umbraco.MacroEngines.DynamicNodeContext
@{
    int eventCategoryFolderId;

    if(!int.TryParse(Parameter.EventCategoryFolderId, out eventCategoryFolderId))
    {
        // not specified? use homepage
        eventCategoryFolderId = -1;
    }

    dynamic eventCategoryFolder = new DynamicNull();
    dynamic eventNodes = new DynamicNull();
    try
    {
        eventCategoryFolder = Model.NodeById(eventCategoryFolderId);
        eventNodes = eventCategoryFolder.Descendants("Event").Where("Visible && endDate > DateTime.Now");
    }
    catch(Exception ex)
    {
        <h3>There was some sort of problem. Possibly an invalid category... Drats...</h3>
    }
}

@if (eventNodes.Any())
{
    <h2>@eventCategoryFolder.Name</h2>
    <ul>
        @foreach (var eventItem in eventNodes.OrderBy("startDate desc"))
        {
            <li>
                <div>
                    <h3><a href="@AutoFolders.XsltExtensionLibrary.NiceUrl(eventItem.Id)">@eventItem.Name</a></h3>
                    <small>@eventItem.startDate.ToString("MMMM dd") @Html.Raw(" - ") @eventItem.endDate.ToString("MMMM dd")</small>
                </div>
                <div class="clear"></div>
            </li>
        }
    </ul>
}