So far all I have encountered that comes close to grinding is getting money. All the rest is event/time based.
All you need to do is to read the hints and wait for the right moment. Of course that can be quite frustrating as well, but this has nothing to do with grinding, there are no stats to raise by grinding.
The hardest time I had was when everything was done but one task. THAT can take forever, if the RNG doesn't like you. But still it's not grinding.
Well, the game is not for everyone, I hope you find what you are looking for.