Thanks for your comment, Nicole. The steps are simples:
1) First, review the material beforehand (literary text or other).
2) Ask the attendees who want to participate, thus establishing participation shifts.
3) In the defined order, the participant selects which part of the literary text impressed it, for example, and why he chose it, relating it to the current context or some similar experience that lived.
4) Then, the other participants can comment on it, it may be that they have chosen the same point and it deepens on the subject, always with respect and listening.
5) This continues the cycle until completing the participant shifts. It concludes with a summary of the topics discussed.
Agreements are established for the following gathering (literary, artistic or cinematographic) My favorites are the literary gatherings (tertulias literarias).
About the challenges, the time to share, we seek that they are not more than an hour, the teachers are very tight in their time and our goal is to inspire them and share freely.
In the virtual works better that the moderator can share screen and thus all see the resource that will be discussed.
That a single moderator assumes up to 50 people in the virtual room, if there were more participants that another virtual room opens because we want to hear more voices and encourage participation.
That the space is very interactive as much as possible, they can also use the chat to comment on it, when there is a text that moves emotions the chat explodes so to speak.

I hope I have helped with the queries and thanks again.