Frist you change the date to Easter or Halloween you dont have to change the year though.
If you change it to Halloween you find the pumkin headed person that dos not chase you [Jack] and to do that you have to get close to him/her.After make sure you have 3 candys and go up to him and press A he will give you something and disaper go sell what you got and get a good amount of money.
To make more money quickly change the date to Easter and go digging and dig up stars open the eggs you dig up if bunny foil go to town hall and a bunny will be there talk to him he will give you something.Go sell what you got and presto candy is sellable too.