In one embodiment, a method includes accessing event infor mation associated With an
event listing, calculating one or more category probabilities for the event listing based in part
on the event information associated With the event listing using one or more categorization
models, and associating With the event listing the category corresponding to the cat egory
probability for each category probability greater than or equal to a threshold probability.

In one embodiment, a method includes receiving event infor mation associated with an
event listing, the event information being inputted by a user of an online event management
system at a client device; transmitting the event information to the online event management
system, the event listing being synchronously categorized with the sending of the event
information; and receiving from the online event man agement system one or more
categories associated with the event listing for display to the user at the client device, the …