From 23 Dec 2006 until 4 Jan 2007
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December 24 - January 1
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December 27 - January 3
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June 24 - July 4
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PLAY IT SAFE.STAY INSIDE.SAVE BIG.

Dec 20 - Jan 2
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June 30 - July 10
"Play games to earn special Steam Summer Camp Steam Achievements. Each one earns you a Prize Ticket. Then, redeem your Prize Tickets for all kinds of in-game content (cars, maps, hippos, hats, and more...). Prize tickets must be redeemed during the Steam Summer Camp Sale. You can keep track of all this on your Steam Profile page."
the 2011 Steam Summer Sale enable you to earn tickets by performing daily missions and rewards to choose according to your taste!
View it on the wayback machine click[web.archive.org]
News from Valve
Dear Everyone:

Me, Syl, and Tappet arrived okay at Steam Summer Camp today. A lot of our friends are here too. The folks we left back at Valve--who all got pink-eye and couldn't go--said they'd put up the pictures from camp that we send them (after they're done posting the loads of Summer Camp daily sales and publisher packs on Steam each day). The first one (with our new pals Marty and Max) is there now. This morning, Syl drove Marty's car. Tappet had to work the pedals, but we got it up to 87 miles an hour on the dirt! We think we can get it to go faster tonight.

The counselors have planned a bunch of camp activities each day. Like playing games gets you special Steam Summer Camp Achievements. Then they say you get tickets for each Achievement you earn. Big whoop, right?!? But, guess what? There's a Prize Booth where you can trade your tickets for cool stuff. I made the banner on the booth!

At the end of camp, they're giving away some really big prizes: one-hundred campers get the top ten games on their Wishlist! They were going to have field day races for prizes, but not all of us have legs.

Gotta go.
Sir Roderick Bodkin & Syl & Tappet.

DEC 19 - JAN 1
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July 12 - July 22
You had the chance to vote for the next reduced headlines.

Nov 21 - 26
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Dec 20 - Jan 5
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July 11 - July 22
a chance for the first time to collect cards from the event and create badges and earn prizes

Oct 29 - Nov 1

Nov 27 - Dec 3

Dec 19 - Jan 3
Collect cards from voting, make badges and earn items from games.

June 19-30
Make badges, earn points for your team and get in-game items, community items, team tokens and free games!
Each day the team with the most points wins. 30 members of that team who contributed points that day will win 3 games off their Wishlist. Make sure to update your Wishlist.

View it on wayback machine click[web.archive.org]

Dec 18 - Jan 2
Before the 2014 Steam Holiday Sale all community members had the opportunity to bid for games in holiday steam auction.
View the Cards
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June 11 - 21 June
Play the monster summer game to earn cards and make badges.
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Oct 29 - Nov 2
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Nov 26 - Dec 1
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Dec 22 - Jan 4
Follow the clues from Christmas cartoon and see how far you take!
View the comics
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
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Feb 5 - Feb 12
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23 June - July 4
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From 21 Dec 2017 to 3rd Junuary 2018
Every day users vote for games featured in different categories.

June 22 2017 until July 5 2017
Collect stickers by exploring your queue every day to collect stickers and fill your sticker book. Users who collected all stickers got special badge.

Same as 2017
21 Dec 2017 until 3 Jan 2018

24 May 2018 until 28 May 2018
Complete daily quests to earn the special badge

From June 21 until July 5 2018
Special mini game was available during the sale.
Step 1 > Customize Your Salien Step 2 > Choose a planet Step 3 > Challenge a tile Step 4 > Fight! Step 5 Repeat

29 October 2018 - 1 November 2018
Discounts only for horror games and videos.

Steam awards nominations 2018 + Sale
22 November 2018 - 27 November 2018

Steam Awards 2018 + Steam Winter Sale
December 20 - January 3
This time the sale featured the extremely Cozy Cottage of Surprises
By visiting the cottage every day you can get free items created for the sale.
You can see the sale here[web.archive.org]

By using some of the items you were able to acquire a special badge:

February 4 - 11
By spending money in the store you were granted tokens which can be used for purchasing special items and badges.
Rewards' page still available here

May 24 - 28
By completing tasks every day you can earn a badge and upgrade it. During the event a lot of games were free so task completion was easier.
Event page still available here

Not yet confirmed - 23 June