Although it's not required, some Agents like to MC the shows, and it gives a coherence and structure if you can pull it off. But when introducing people, don't read their bios -- just mention where they're from, one interesting thing about them and their name.
And in general, be nice. Some shows will go well, and some will be shit: that's part of touring. But if you can be welcoming, helpful and interested in the folks on tour it'll make a big difference. This is the first tour for most of them and they're often stressed, even if they don't show it. Some things you can do: