Regular hats for Winter Bash 2020
Social Distancing (Main)

Visit any question page on any main site (including Meta Stack Exchange). Visits through the mobile apps, and visits to tag pages (e.g. https://stackoverflow.com/questions/tagged/c%23) and review queues count as well.
Social Distancing (Meta)

Visit any question page on any meta site (including Meta Stack Exchange). Visits through the mobile apps, and visits to tag pages (e.g. https://meta.stackoverflow.com/questions/discussion) and review queues count as well.
TikTop

Ask a question that gets answered fast.
Ask a question that gets an answer in under 5 minutes. Both the question and answer must have a positive score.
Soapbox

Start a meta discussion.
Ask a question with the discussion tag on a meta site that gets a score of 2 or more and receives 2 or more answers.
Edward

Ask a positively-received question on five different days (get the Curious badge).
Each day during a 5-day period, ask a positively scored question and have no negatively scored, closed or deleted questions.
Hanafuda

5 posts with a positive score.
Post 5 questions or answers during Winter Bash that receive a positive score.
Backlog

Answer an old question with no answers.
Answer a question from 2019 or earlier that does not have any answers. Both question and answer must have a positive score.
Note: Question cannot have any deleted answers.
Snaphat

Answer in 30 minutes, +3 and accepted.
Answer within 30 minutes of the question being asked. Answer must have a score of 3 or more, and the question asker must accept it.
Rep Hunter

10 answers in 1 day with positive score.
Post 10 answers on the same day. All answers must have a positive score.
Kitsune

Vote to reopen and answer a question.
Vote to reopen a question, and answer it when it gets reopened. Both actions must occur during Winter Bash.
I Wish to Subscribe

Upvote 3 feature requests on MSE.
Upvote 3 questions with the feature-request tag on Meta Stack Exchange.
Bûche de Noël

Ask, answer, or vote on December 25th.
Ask, answer, or vote ±12h from Dec 25, 0:00 UTC
Note: Doesn't award hats for activity on per-child metas or Stack Overflow Teams.
Where in the World?

Post or vote on Dec 21.
Ask, answer, or vote ±12h from Dec 21, 0:00 UTC. This hat comes in two versions, but you can only get one.
Where in the World?

Post or vote on Dec 21.
Ask, answer, or vote ±12h from Dec 21, 0:00 UTC. This hat comes in two versions, but you can only get one.
Happy New Year

Chat on Jan 1.
Post a message in chat ±12h from Jan 1, 0:00 UTC. Message must be starred.
Milliner

Collect 11 hats.
Collect 11 hats on a specific site.
Bouncer

3 successful close vote reviews.
Make 3 reviews in the close votes queue that ultimately get handled the way you recommended, and at least one other reviewer took the same action as you.
Doorman

3 successful reopen vote reviews.
Make 3 reviews in the reopen votes queue that ultimately get handled the way you recommended, and if voting to Leave Closed at least one other reviewer took the same action as you.
Chimney Sweep

3 successful suggested edit reviews.
Make 3 reviews in the suggested edits queue that ultimately get handled the way you recommended.
Note: Reviewing directly from the post page also counts.
Wa-boushi

Earn the Guru badge.
Post an answer that gets accepted and has a score of 40 or more (earn the Guru badge).
Carmen

Suggested edit approved.
Suggest one or more edits that get approved during Winter Bash. Tag Wiki excerpts count, which is helpful for some privileged users.
Gimme Space

Join new community.
Join a Stack Exchange community that you have never participated in.
Flashlight

Try Dark Mode.
Have Dark Mode enabled and visit a page on Stack Overflow in English, Japanese, Portuguese, Russian, or Spanish.
Comin' Up Roses

Ask a +5 question with 5 answers.
Ask a question with a score of 5 and above that receives at least 5 answers. All answers must have a positive score.
Matryoshka

10 successful close or reopen votes.
Vote to close or reopen 10 questions that ultimately get closed or reopened