The phrase "activities at which" is correct and usable in written English.
It can be used to refer to specific events or tasks where certain actions or behaviors take place.
Example: "The conference will include various activities at which participants can network and share ideas."
Alternatives: "activities where" or "events in which".
They often prefer the kind of thinking involved in chess and math, activities at which I am almost as inept as I am at soccer.
His workouts include scooting around the underbrush on all fours, leaping between boulders, playing catch with stones, and other activities at which he believes early man excelled.
It would be the first of many sporting activities at which I would lose to him, but I didn't care because we were together.
The merchandise they are hawking is the every-night-is-Halloween wardrobe and accouterments to activities at which every child who watches "South Park" has learned to howl with laughter, largely because once upon a time it was supposed to be dirty.
The fact that Strategic Awareness was identified as a weakness (activities at which she did not deliver high performance and which de-energised her as well), could be justified since, being concerned with the everyday performance of the employees and the deliverables they had to produce, most of her time and attention was absorbed away from business strategy.
Self-efficacy can be measured using validated scales specific to the behaviours and activities at which an intervention aims to influence [ 26- 28].
They also experience more "flow", the sense of being totally absorbed in an activity at which you are an expert.
As a boy he almost sliced off a finger with an axe in his backyard while chopping wood – an activity at which he later excelled.
Mr. Bush is said to prefer formats in which the candidates can converse, rather than formally debate -- an activity at which Mr. Gore is generally thought to be the more skilled.
Sales taxes are commonly classified according to the level of business activity at which they are imposed at the manufacturing or import stage, at the wholesale level, or on retail transactions.
And despite the recent creation of Hite Dry Finish a step in the right direction brewing remains just about the only useful activity at which North Korea beats the South.
