I really think that events should be part. Good or bad. If you get a good one, good for you. If you get a bad one, better luck next time. I myself have 1 good event and 1 bad event. The bad one overwhelms the good one by .5 happiness, but you can still rebuild it. I started buying some more tech and my happiness is higher than it was before the whole event happenings. If you don't want events to happen, than collect taxes less often kswiss2783 mentioned. Based on percentages, if you collect taxes and pay bills each day, you should get at least one every 5 days. If you were to do those actions less often, than the wait becomes longer.
I see no wrong in events, good or bad.