Conference Guide

In preparation for the conference

To have the best possible experience at DevConf.CZ 2021 we have prepared the following checklist for you to prepare beforehand. Take a look at the following technical requirements and things you can do to prepare before the conference so you don't need to do them during the conference.


Be sure that you're registered for DevConf.CZ 2021 at Hopin as a speaker. If there is a message with "You're in!" at the beginning of the subject that means you are. Take the opportunity to add the conference duration to your calendar by clicking on "Add to calendar".

Internet speed

Try to connect with a minimum of 5Mbit/s download and 2Mbit/s upload speed. The higher upload and download speeds will offer a better experience, ideally 30Mbit/s download and 10Mbit/s upload speed. Try limiting other consumers of your Internet capacity, e.g. try running software updates a day before to prevent them from running during the conference, pause or stop any large downloads, if need be disconnect other devices from your network. Using a physical cable connection is recommended. You can check your Internet speed by using an online network speed test website, search for Internet speed test in the web search engine of your choice.

Web browser

Hopin supports Google Chrome (preferred) and Mozilla Firefox (backup) other browsers are not supported. Please make sure that your browser version is up to date, follow the instructions for Google Chrome and Mozilla Firefox.

Note that Safari uses the same engine as Chrome, but anecdotal reports are that Safari causes problems, so please use Chrome instead.

Reduce the number of open tabs and disable unnecessary browser extensions. Try not to open several browser tabs with Hopin, or if you need to mute all but one of the tabs.


Do try using a desktop or laptop computer, if you're using a tablet or a mobile device make sure that you're using Google Chrome or Mozilla Firefox.


Browse the documentation on Hopin tailored for attendees and speakers.

Select sessions

Browse our schedule at After log in, you’re able to make a selection of the sessions that interest you and create your own schedule. At the beginning of each session at sched, you can find a round checkbox, clicking on it will add such a session to your personal schedule. Times shown for each session reflect times in your local timezone, so make sure your computer has the correct timezone configured for your location and you have a proper time zone selected at the (select box in the right column under search field).

During the conference

During the conference you might run into some issues, we have compiled a list of most common ones, and general recommendations to avoid them.

Audio and Video

Here is a list of recommendations for the best experience with audio and video during the conference:

  • You are not able to share audio/video by default. All speakers and attendees can request to share their audio and video. The session chair will then grant you access.
  • To maximize speaker video or presentation video double click on that video stream, this will enlarge that portion of the video stream.
  • Play audio using headphones, this will help in understanding the speaker, and prevent any audio feedback.
  • If you have multiple input video/audio sources, be sure you set proper one.
Notes for speakers

As a speaker please take into consideration the points mentioned above, and also in addition to that the following.

Conference support on Hopin and Discord

Once in the hopin platform, as a speaker, you can access the Green Room and test your audio/video setup and slide sharing before your session starts. If you experience any issues, we will be providing support in the same room.

As a speaker access the Discord Server and set up your account. We will be providing support on the #speakers channel.

For your session

Please join the session 10 minutes before the scheduled time to connect with the session chair and prepare your slides, audio, and video setup. The same applies to pre-recorded sessions, we ask you to be present during the stream and interact with the audience. Note that all live sessions are recorded, and will be shared on YouTube afterwards.

Sharing screen

When you enter the session ask for permission to share your audio/video during the break. Once you are granted access, you can control screen sharing using the monitor icon in the row with four buttons along the bottom. If the icon is crossed with a red line that means you're not sharing your screen, click on the icon to start sharing.

On Linux desktops using Wayland sharing the screen in Firefox is somewhat involved. You might need to confirm twice what part of the screen you want to share.

Similarly using Chrome (or Chromium) on Linux desktop using Wayland sharing the whole screen might end up exposing a completely black screen. In that case, make sure that you're sharing the window of a single application or single tab within Chrome.

On Mac, you may have to alter security preferences to allow screen sharing. If you are not able to share, look under SystemPreferences → Security & Privacy → Screen Recording. Click on Google Chrome to enable sharing application windows. Please note changing the settings will close Google Chrome and you will need to open the browser again and rejoin the Hopin session.

Playing audio as a part of the presentation

As you play sounds from videos or as a part of the presentation your operating system to prevent feedback will block that audio from the microphone. To succeed in playing audio as a part of the presentation have a look at the solutions documented at Hopin support page on Sharing Computer Audio During an Event.

Derived from ApacheCon.