1. A computer-implemented method comprising: identifying a first plurality of user-submitted content items available to a communication system that are related to at least one user of a plurality of users, wherein the identifying of the first plurality of user-submitted content items includes: using a plurality of user identifiers for the plurality of users to identify a second plurality of user-submitted content items posted to the communication system by the plurality of users, analyzing the second plurality of user-submitted content items including metadata, content, or users identified within the content of each of the second plurality of user-submitted content items, generating a plurality of candidate content items, wherein the plurality of candidate content items is a subset of the second plurality of user-submitted content items, selecting two or more of the plurality of candidate content items as the first plurality of user-submitted content items; aggregating the first plurality of user-submitted content items into a bundled event memory, wherein the bundled event memory is a set of one or more files capable of being presented to users on user devices; and transmitting the bundled event memory to at least one of a plurality of user devices to be presented to at least some of the plurality of users.