Unfortunately by the architecture of WLJS, it is not possible for multiple users to edit the same notebook at the same time.

However! I would prepare presentation using WLJS with interactive elements, then export it asHTML. In general with some minor adjustments interactive widgets such asManipulate,Animate and etc are automatically compiled down to Javascript and embedded into exported HTML automatically.

The last issues to solve: how to communicate back from exported HTML to the teacher's notebook. Slides in WLJS do support<script> tags, and by the default Wolfram Engine freeware license provides an access to DataDrop, which also has web API. This means, one can simply write a basic fetch request to a single DataDrop, while on teacher's PC there will be something likeRefresh[DataDropGet[..]//Plot, Quantity[5, "Seconds"]].

In general you do not need to write all of this every time. Slides in WLJS support components approach, so it can be just a sort of basicImport or something like that.

I would convert this issue to a discussion and provide you an example later with such system, if you want :)

Here we go:

requires WLJS Notebook >= 2.8.4

(please change the extension to .wln)
Interactive Polls.json