Question: What factors should be taken into account before letting big groups get together?

Answer passage (source: WHO):
page_title: Q&A: Mass gatherings and COVID-19
section_headers: What factors should organizers and health authorities look at when assessing whether the risks are acceptable or not?
section_content: For countries not currently known to be experiencing community transmission of
COVID-19, the priority consideration will be whether the planned mass
gathering event substantially increases the risk of the virus entering the
country and becoming established, as well as the risk for participants to
importing infection back to their home country and further increasing global
spread. In making this assessment, the organizers and their national or local
health authorities should recognize that the risk of imported cases of
COVID-19 is naturally linked to international travel. They should also
recognize that it is neither realistic or desirable to aim for zero risk. When
organizers and health authorities are determining whether to hold a mass
gathering, they should determine what is an acceptable risk and what
additional measures should be implemented to mitigate the risks.
For countries where COVID-19 has already started to spread in the community,
key consideration will be:

aiming at containing or at least slowing down the spread of the virus in the local community/country.
preventing participants from other countries being infected with COVID-19 

In each case the risk should be considered in the context of the known
features of COVID-19, its severity, its transmissibility and the effectiveness
of measures to prevent or reduce transmission. The strain already placed on
the local health system in responding to COVID-19 outbreak(s), and the
additional strain the mass gathering might place on the system also need to be
taken into account.
You can find more advice on what to look at in the WHO document Key planning
recommendations for Mass Gatherings in the context of the current COVID-19
outbreak of 14 February 2020. See: https://www.who.int/publications-
detail/key-planning-recommendations-for-mass-gatherings-in-the-context-of-the-
current-covid-19-outbreak

Reviewer feedback on this answer:
Gives advice and links to more detailed recommendations about how to safely plan mass gatherings during the pandemic.
The answer does a good job of providing detailed information about mass gatherings. It talks about them in both areas with a lot of spread of the virus, and not a lot of spread.

Reviewer ratings:
Excellent
Excellent

Answer passage (source: WHO):
page_title: Q&A: Mass gatherings and COVID-19
section_headers: How large does a meeting or event need to be in order to be a “mass gathering”?
section_content: High profile international sporting events such as the Olympics or World Cups
as well as international religious events such as the Hajj count as mass
gatherings. However, lower profile conferences and events can also meet WHO’s
definition of a mass gathering. An event counts as a “mass gatherings” if the
number of people it brings together is so large that it has the potential to
strain the planning and response resources of the health system in the
community where it takes place. You need to consider the location and duration
of the event as well as the number of participants. For example, if the event
takes place over several days in a small island state where the capacity of
the health system is quite limited then even an event with just a few thousand
participants could place a big strain on the health system and then be
considered a “mass gathering” event. Conversely, if the event is held in a big
city in a country with a large, well-resourced health system and lasts just a
few hours, the event may not constitute a “mass gathering” event.

Reviewer feedback on this answer:
Defines what qualifies as a mass gathering, but doesn't specify criteria for deciding when they can be safely held.
The answer addresses mass gatherings, but provides more of a definition, than guidelines for having mass gatherings. So it doesn't really relate specifically to the question.

Reviewer ratings:
Bad
Could be Improved

Answer passage (source: WHO):
page_title: Q&A: Mass gatherings and COVID-19
section_headers: Where can I find more advice on assessing and managing health risks around international mass gatherings?
section_content: WHO has produced guidance and also a training course on how to plan for a mass
gathering. The guidance and the course both look at how to conduct a risk
assessment, plan for and manage health risks in partnership with the local
authorities: https://www.who.int/emergencies/diseases/novel-
coronavirus-2019/technical-guidance/points-of-entry-and-mass-
gatherings You can find advice to give
individual participants on how to protect themselves and their loved ones from
COVID-19 at: https://www.who.int/emergencies/diseases/novel-
coronavirus-2019/advice-for-public

Reviewer feedback on this answer:
Links to detailed resources about safely planning mass gatherings. Fully addresses question.
The answer provides a little bit of guidance for mass gatherings, but it is more in the form of links, rather than any detailed information contained in the answer.

Reviewer ratings:
Excellent
Acceptable