After create sponsor, should prompt to add to an event

[mattstratton]

Something like this

your sponsor has been created! Do you want to add it to an event? y/N: 'y'
Enter the city: 'Ponyville'
Enter the year: '2017'
Here are the sponsor levels for ponyville. Select one:
 Gold
>Silver
 Bronze
Added 'sponsor' as a silver sponsor for ponyville