For concerts we often have no precise time information, when the main performers and support artists have their performance. But the order in which they perform is clear in the most cases. Is it a considerable enhancement to add an order field like we have it in Series-Event rels?
Same would be nice for festivals when we have stage sub-events. There we can not determine a order client side like for day sub-events (date). But often the stages have some kind of order. Like the importance/size or like printed on flyers/website.