A method implemented by one or more processors, the method comprising:
- determining that one or more messages of an ongoing multi-user communications session reference a collection of activity types,
- wherein the determining is based on processing of content of the one or more messages of the ongoing multi-user communications session,
- wherein a plurality of users is participating in the multi-user communications session via respective client devices, and
- wherein the collection of activity types includes at least a first activity type and a second activity type;
- selecting one or more activity instances for each of the activity types of the collection, wherein selecting the one or more activity instances for each of the activity types of the collection is based on preference metrics for each of the users, and wherein the activity instances include multiple activity instances for the first activity type and multiple activity instances for the second activity type;
- generating a plurality of ordered sets of the activity instances, wherein each of the ordered sets of the activity instances includes a corresponding one of the activity instances for each of the activity types;
- for each ordered set of the activity instances, of the ordered sets of the activity instances:
- processing, using a trained machine learning model, respective features of the ordered set of the activity instances to generate a respective feasibility score for the ordered set of the ordered activity instances;
- selecting a subset of the ordered sets of the activity instances based on the feasibility scores, the subset including at least a given ordered set of the activity instances;
- causing, in response to the selecting, a representation of the given ordered set of the activity instances to be rendered at the client devices as part of the multi-user communications session;
- and
- in response to receiving at least one instance of affirmative user interface input responsive to the representation being rendered:
- causing each one of the client devices to render a respective interface element that, when selected, causes a respective one of the client devices to interact with at least one remote computer system in confirming at least one of the activity instances of the given ordered set of the activity instances, wherein the respective one of the client devices interacts with the remote computer system in a manner that is tailored to the respective one of the client devices to confirm the at least one activity instance for the respective user of the one of the client devices.