The following keywords are specific activities, generally things you do rather than things you solve.
answer given for completing task
ballet
blindness
Bluebikes
charities
construction
cooking/bring us food
costumes
creative tasks
diving
dog shows
dress-up
events
events staged multiple times
fireworks
house of cards
intermediate tasks
karaoke
Learned League
marching band drill sheets
MIT ID cards
New England Aquarium
New York Times crosswords
occupations
picking locks
Pset (MIT homework set)
restricted solving
Roadkill Buffet
roller coasters
ski trails
stalking
staring contest
swimming
teamwork time
texting
toppling dominoes
Viking River Cruises
weaving