Winter Bash 2017 Hats

Question

Here's the traditional Winter Bash hats post. Same as last year there are two (and only two) answers: one for the secret hats, and one for the regular hats.

Remember there are no hats for guessing secret hat triggers, nor one for pinging SE employees.

Only edit the secret hat answer with definitive and correct triggers. This is not the place to post guesses.
Please put secret hat triggers in a spoiler.
If you'd like to discuss hats further and/or work towards identifying what their triggers are, please do so in the Winter Bash chat room.
Note comments are not meant for extended conversation, discussion etc of any hat, use the chat room for that.

If there are regular hats that are not listed yet, please edit and add them. If you know more specific info about one of the hats (example: time zones), edit that in, a source would be preferable.

Here are some of the hats of previous Winter Bashes:
Winter Bash 2016
Winter Bash 2015
Winter Bash 2014

Because It's important to know your history... in more ways than one.

Answer 1

Secret Hats

Click on each of the hats for a larger image.

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Ooh, Shiny!

Flag a question for closing, cast a close, delete or reopen vote on a question. You don't have to be the last vote, and hammers work.

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Cosmic Brain

Earn the Nice Answer badge. [Answer score of 10 or more]

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Galaxy Brain

Earn the Good Answer badge. [Answer score of 25 or more]

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Universe Brain

Earn the Great Answer badge. [Answer score of 100 or more]

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Rep Cap

Well, this one is obvious - reach the reputation cap. Actually, it's enough to reach 200 rep even without hitting the rep cap.

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Mother of Dragons

Procedure confirmed by animuson:

• Visit a site where you have never posted a question or answer before (even if it's been deleted).
• Post a new question or answer during Winter Bash.
• Get its score to at least 3.
• Wait until the post is 3 days old.
• The post cannot be deleted or community wiki, and if it's a question, it cannot be closed.

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Row Of Many Candles

Participate in a site (vote, post a question, post an answer, etc...) while it's 2017-12-20 (the last day of Hanukkah 2017) anywhere in the world. The hat was first triggered on 2017-12-19 10:00AM UTC.

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Some Kind Of Sun Thingy

Participate in a site (vote, post a question, post an answer, etc...) while it's 2017-12-21 (the winter solstice) anywhere in the world. The hat was first triggered on 2017-12-20 10:00AM UTC.

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Red Hat With White Fur Trim

Participate in a site (vote, post a question, post an answer, etc...) while it's 2017-12-25 (Christmas day) anywhere in the world. The hat was first triggered on 2017-12-24 10:00AM UTC.

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Glasses With A Number On Top

Post a message in chat ±12h from Jan 1, 0:00 UTC that gets starred

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Answer 2

Regular Hats

In celebration of the 6th anniversary of Winter Bash, some of the most beloved hats from previous Winter Bash are making a comeback. (Stack Overflow Blog)

The year and name of a hat's previous appearance are noted below each hat.

Click on each of the hats for a larger image.

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IDENTIFICATION DIVISION

earn a silver badge

from 2015: Amazing Grace

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The Mad Hatter

edit, or suggest an edit, 5 times in a single UTC day without commenting on the post

from 2016: The Hatter

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Foot of the Rainbow

earn a gold badge

from 2013: I See Your Point

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Just Jesting

post 10 comments that each earn an upvote

from 2012: Just Jesting

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Explorer

post an accepted answer that receives no other votes for 12 hours

from 2015: Explorer

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Too Cool

vote on seven questions or answers using the Android or iOS app

from 2013: Before It Was Cool

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The Milliner

collect 11 hats

from 2013: The Milliner

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Hero Of Time

ask a question when it is 7:00 (am or pm) in any time zone

from the original Arqade's Hat Dash - 2011: Link's Hat

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Sherlock

ask a question and answer it yourself, with both posts getting a score of 3

from 2016: Elementary

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Taco Tuesday Any Day

post five answers that each get a score of at least 3

from 2016: Don't Wanna Taco 'Bout it

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Werewolf Hunter

edited 5 questions that were posted more than a year ago

from 2014: Werewolf Hunter

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Like Clockwork

visit the site on 10 consecutive UTC days

from 2016: Like Clockwork

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Think!

for 6 separate questions or answers, post gets edited by owner after you comment on it

from 2013: R-E-S-P-E-C-T

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Fashionable

get over 9,000 combined total views on all questions that you asked during Winter Bash

from 2016: Trendsetter

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Silencium

answer a question that has never been commented on; your answer gets no comments and scores 7+

from 2012: I Do Say

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Brunhilde

earn 150 reputation points on three different sites (not including Stack Overflow) within 15 days.

from 2012: Brunhilde

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It’s-a me!

delete 6 comments from under posts (not your own) that were edited by their owners after you commented on them

from the original Arqade's Hat Dash - 2011: The Numismatic

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This Is Fine

delete 10 of your own comments posted in 2017 before the start of Winter Bash

from 2016: This Is Fine

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I’ll Handle It

vote to close a question, edit it from closed, vote to reopen

from 2015: Do it Yourself

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Fascinator

use the site's search function on 3 consecutive UTC days

from 2015: Fan-hat-ic

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Waffles

answer a question scoring -3 or lower; the question eventually becomes 3+ and your answer becomes 5+

from 2014: Waffles

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And YOU Get A Hat!

own any hat while the entire site collectively has at least 20 distinct hats

from 2015: Every! Body! Gets! A Hat!

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Extra Toppings

post a competing answer to an existing accepted answer, reaching a score of at least +3

from 2014: 30 Minutes or Less