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From our experience we've had a number of character encoding issues with the Event Module (not just with the REST API, and we are on 188.8.131.52). Most of the bugs that we filled are still open right now, though I've been told that some of them might be fixed in Jive 7 or 8.
In our case, I guess we'll have to wait and see if they've been fixed or not in Jive 8.
We found workaround for this issue. Event can be created via core Content REST service. It provides the same functionality and the problem with character encoding does not occur any more.