@Robert Yes :-) The question is if he's asking in general, maybe for other contexts and use cases (maybe related to Corona virus volunteer coordination?), or if it's in reply to the recent Peeragogy editing call and its scheduling (since a call took place on Tuesday per e-mail announcement, and he asked on this Peeragogy mailing list). I wondered if Peeragogy already has a calendar or a scheduling practice, I think I saw one somewhere. Regardless of the later use, if Peeragogy was/is using something, it could be reviewed, the experience with it shared, recommendations made, etc.
I brought up a calendar specifically because scheduling events with days and hours tends to be more tricky than it seems at first, and calendars plus many solutions of that category should cover most of these, despite not always in very convenient ways (too bloated etc.). Another, simpler option is to enter time slot offers/options in prose, but then, not being structured data, it's hard to do automatic matching for best fit or to render a decent visualization, especially given the lack of date/time support as found in calendars. Some time ago, I tried to do a little Doodle clone for surveys with a colleague from work, but it turned into a technical experiment because I used this occasion for an attempt to build an actual ReSTful service with true hypermedia (in terms of HATEOAS), which hardly exists anywhere, and as easily imaginable, it remained an incomplete, unfinished technical experiment, because it's relatively ~difficult~ for lack of real hypermedia formats and ReST methodology, which is totally not the way the Web works despite it should.
I'm sure RSF could easily support something along the lines of voting/survey for event scheduling, maybe some of the matching (just not for roundtable participants or skills/interests/need-requests/offers, but time slots and availability). But then Graziano might ask about polished enterprise-grade products/solutions that are ready today. Have seen a few variants for both calendar and survey, but none that's terribly good in particular, unfortunately.