Possible hints for hockey game:
-Long package is obviously hockey sticks

(Probably more realistically hockey pucks after discussion in the comments)
http://www.usfirst.org/roboticsprogr...5-kit-of-parts
-In the source code for the site, the word "Choice" in the title "FIRST Choice" is split into "Ch", "o", and "ice". The word "ice" being alone is the first real hint towards it being a hockey game.
view-source:
http://www.usfirst.org/roboticsprogr...5-kit-of-parts
-However, The "Ch" and "o" must be important because they are also separated. Since they posted all of this 24 days before the kickoff, and openly acknowledged it was 24 days until kickoff, let us assume 24 is important. If you google "24CH", you will find it is the title of a hockey documentary.
http://www.usfirst.org/roboticsprogr...blog-Kit-Hints
http://canadiens.nhl.com/club/page.htm?id=86513
-The final and most convincing hint: the remaining "o" looks like a hockey puck.
Hockey game confirmed.
New:
-FIRSTweets posted a picture related to lunacy, possibly a hint of a low-friction surface (for hockey).
https://twitter.com/firstweets/status/543108834932563968
Edits:
Added info about tweet and added info that long box is more realistically pucks.
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Team 2403: Plasma Robotics
Member 2014-2017, Head Programmer 2015-2016, Leadership Team 2016-2017, Co-President 2017