how to collection an event's data of an orginaztion in dhis2?

hi,all

I found dhis2 can collection info of an org at specified period repeatly, personal info at unspecifed time by program. but

How to collect some event information of an org, which occures at any unspecified time.may by many times.

Thanks.

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此致

easy

莫愁前路无知己,天下谁人不识君。