[EVENTS] Events summary issue

[johny-b]

Event-related things that are necessary for an events release:

• #751
• #759 <- few minor-but-important things
• #760 <-heavy task with subtasks
• #758 <- anything related to non-handbook documentation goes here
• https://github.com/golemfactory/yagna-docs/issues/95

Major event-related things that we want to do, but we might consider releasing events without them:

• #778
• #777

And minor things that are not really important, but could be useful:

• #825
• #784