Prototyping:

		{exp:channel:entries channel="events"}
			<h1>Concept: {title}</h1>
			{embed="prototyping/getfuture" entry_ids="{reverse_related_entries channel="agenda" backspace="1"}{entry_id}|{/reverse_related_entries}"}
		{/exp:channel:entries}

Getfuture:

{if embed:entry_ids}
{exp:channel:entries channel="agenda" show_future_entries="yes" show_expired="no" entry_id="{embed:entry_ids}"}
			<h2>Agenda-item: {title}</h2>
			{agenda-rel-artists}
				<h2>Stage: {stagename}</h2>
				<ul>
					{embed="prototyping/getlineups" entry_ids="{artists:entry_ids}"}
				</ul>
			{/agenda-rel-artists}
		{/exp:channel:entries}
{/if}

Getlineups:

{exp:channel:entries channel="artists" fixed_order="{embed:entry_ids}"}
	<li>{title}
	{reverse_related_entries channel="livesets"}{if count >= 1}(liveset beschikbaar){/if}{/reverse_related_entries}
	</li>
{/exp:channel:entries}