So I threw together an article based on what I know of 8chan's history. I only arrived around September and information before then is scarce, so this could definitely use some filling out. All dates before then are based on research and guesswork, and may be completely wrong.
2013October 22 - copypaste creates 8chan, inspired by STI's (of Tinyboard and 4chon fame) refusal to create new boards when the users wanted them.
October 23 - First board is created. /albertross/ (dead)
Probably this year - First and second migrations as laid out by copypaste here >>>/b/1360579 . Lowcard becomes a global.
2014February 22 - /waifuist/ is created by refugees from /tv/ after the mods cracked down on inane posts.
June 9 - /legion/ is founded by /co/ refugees.
2 September - Fifth migration/"First Exodus", after Five Guys (not yet Gamergate) is banned on /v/. /burgers/ is created, but sparsely populated as of yet.
September 18 - moot goes full retard and makes the "4chan is not about free speech" sticky on /v/. People repulsed by this flock to 8chan's /v/, which remains one of the fastest boards on the site.
September 19 - "Fuck it, We're Out" propaganda images are spammed on 4chan encouraging people to leave for 8chan by 10 October.
September 20 - Hotwheels upgrades the servers four times in a day to accommodate for the massive surge of traffic.
September 22 - Hotwheels announces a partnership with 2ch.net, the largest japanese textboard on the internet.
Late September - Hotwheels invented as a nickname for copypaste AKA Fredrick Brennan.
October 10 - Some people have left. 8chan gets a sizable number of migrants from /b/.
October 16 - 8archive is opened by Drybones.
October 20 - 8chan taken down by a DDoS attack. Promptly brought back up.
October 23 - Rei migrates to 8chan, and is subsequently banned from all boards that he frequents. He takes to whining on /meta/, and subsequently creates /politik/ as a replacement.
October 26 - A shitstorm erupts over /fem/, with anons demanding that Hotwheels remove it from the header. He agrees, and blacklists several other boards including /hebe/, /furry/, and /cuteboys/. He later goes back on this decision, deciding that it is not in the spirit of free speech or the site.
October 28 - Hothweels moves to the Philippines to work with 2ch
November 8 - /pol/ style flags added.
November 24 - DoS attack via search.php brings down 8chan for a few hours.
Late November - Anon makes a thread on /meta/ asking why moderator notes were visible across boards. Hothweels removes the feature entirely and hashes IP addresses to prevent any further potential for abuse.
December 1 - /gg/ is given back to Niko_of_Death. Users immediately revolt. /gg/ is completely destroyed by high power shitposting and /gamergate/ becomes the replacement board. This is the largest board exodus in 8chan history.
December 7 - "Second Exodus", following moot's destruction/funpostization of /pol/.
December 8 - Ponyfags steal both the 1M get and 999999 get on /b/. /b/ raids MLPchan in retaliation.
December 10 - Foxworth posts on /b/ for the first time, with a Blender screenshot of his character and 3D text reading "Sup 8chan". He will grow to become one of 8chan's most profitable lolcows.
December 12 - Following a wave of "muh shills" bans on /pol/ and binary-encoded bait being posted by one of the volunteers, Hotwheels nationalizes the board. He later creates /news+/ and returns /pol/ to its original owners.
December 25 - Three sticky threads for Christmas, wishing Hotwheels, 8chan, and fellow anons a merry Christmas.
December 27 - /baphomet/ is created as an edgier alternative to /b/ with "less cancer".
December 28 - 8chan goes down for a server move.
2015January 8 - 8chan gets hit with a DDoS instigated by
srhbutts and Dan Olson unknown SJWs, using LizardStresser. This attack brings down the entire 2ch network for over 7 days.
January 9 - Hotwheels creates Weekendchan as an 8chan substitute while doing upgrades to mitigate the DDoS. It is promptly raided by anons from Ylilauta, who spam dicks on /b/. They are repelled by an animu counter-spammer.
January 10 - 8chan comes back online with few interruptions.
January 12 - SJWs go to Cloudflare and Internet.bs, 8chan's domain registrar, with CP claims. Cloudflare doesn't give a fuck and automatically reveals who sent said claims, but I.bs shits itself and suspends 8chan.co. 8chan moves, temporarily, to 8ch.net. /baphomet/ has a field day and doxxes the bullshit claimants.
January 13 - Hotwheels gets the 8chan.co domain back, but has warmed to 8ch.net. The domain move is now permanent.
February 8 -
>>>/baphomet/ is unlisted from the board list after being wiped for the third time, this time by a compromised volunteer account.
February 11 - Law and Order SVU airs an episode loosely based on gamergate that features a site called "redchanit" (a mashup of reddit and 4chan/8chan.) that is used to harass an innocent fictional female game developer. The board
>>>/redchanit/ is created and a CSS based off of it's appearance in the show is added to the CSS list. Hotwheels buys the domain redchan.it and has it redirect to the board.
February 12 - A user on
>>>/baphomet/ reposts the dox and SSID of a federal judge. The post was removed by the global administration for being illegal in the United States.
February 16 -
>>>/operate/ is created by hotwheels as a replacement for
>>>/meta/ due to intense tripfag cancer and shitposting.