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Ivan sklyarov 2Ivan sklyarov 2 

opportunity event custom form

I need a custom opportunity event hendler. 
behavior: on user click on button, request calls remote server and fill event location and description fields.
As I understand  it is impossable to integrate such button to existing `Opportunity`->`New Event`
that's why I've created new visualforce page for `quick action` with set of fields which similar to `New Event` component

But what should I do to save opportunity event ?