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CC 2021
Tue 2 - Wed 3 March 2021 Online Conference

We will use Whova, Zoom and Slack to run PPoPP/CGO/HPCA/CC virtually in addition to the publicly-available web pages of individual conferences.


You need to register to CC to attend the virtual conference.

Registrating to CC allows you both:

  • to attend synchronous, live sessions
  • to access the conference material (papers, videos, and slack channels) for an asynchronous participation

Registration is available through Whova : see here.

When registering, please indicate that CC is the main event you will attend.

Registering to CC gives you access to all other co-located events.

Don’t register with the “Joint Panel”-only ticket, or you won’t be able to attend the CC events.


We use Whova for registration, and as the main virtual venue.

On Whova, you will find :

  • The complete agenda, with sessions and information about the technical papers
  • Links to the pre-recorded videos, the slides, and pdf files of the papers
  • Links to the Slack channels and paper threads for discussion of the papers
  • Links to the Zoom webinars for the live sessions, workshops, tutorials…


NOTE: To join the Zoom webinars, we recommend using the Zoom client, or the Google Chrome web browser.

Live sessions for paper presentations will run as Zoom webinars:

  • Pre-recorded videos will be broadcasted in the Zoom webinar

  • During a paper presentation, ask your questions through the Zoom chat, not Slack or Whova.

    Focusing on one tool will facilitate smooth discussion during the session.

All the Zoom links will be available in Whova’s Agenda.

You can also join the Zoom webinar directly from Whova, where it is embedded.


A Slack workspace is shared for all co-located conferences.

You have to join the Slack workspace to be able to see the channels.

How to join the Slack workspace?

An invitation link is provided in the description of each Whova session.

You need to join the Slack workspace with the invitation link only once.

Available channels are:

  • #cc-announce: channel for general CC announcements

  • #coffee-break: general, shared channel, where to hang out during the breaks

  • #cc-sessionnumber-sessionname: one channel for each of the program’s sessions.

    For instance, the channel for the third CC session is #cc-3-safety-and-correctness

  • #help: general, shared channel, where to seek for technical help

How to join Slack session channels?

Slack Session channels are not shown by default.

You will have to join them:

  1. In the “Channels” menu on the right, click on “Add channels”

  2. Then click on “Browse all channels”

  3. Select in the list all the CC session channels you want to join.

    Hover on their name, and then click on the “Join” button appearing on the right.

Usage of Slack session channels

Session channels are used for off-line and follow-up questions and discussions about the papers.

Thus, in one session channel, two or three papers will be discussed (we are following the model of PLDI 2020):

  • One thread is created per technical paper. You can also find the link to the paper thread’s under each paper sub-session in Whova.
  • If the corresponding session is not live, please use Slack, not Whova or Zoom, for Q&A and discussion of the technical papers.
  • Please post a question or a remark as a reply in the specific paper thread. This will help prevent various topics of different papers from getting tangled in a Slack channel.
  • When a certain session is live through Zoom, please refrain from using Slack or Whova chat, and please ask questions through Zoom. Once the session is over, feel free to resume using Slack.

Further notes

  • Please do not share the Whova or Slack links and passwords. This will protect us from copyright-related issues and Zoom-bombing.
  • For those who cannot view the embedded videos in Whova, use the links to the video files instead.
  • Use the community feature to ask questions about logistics, e.g. through Ask Organizers Anything on Whova, or in the #help Slack channel.