The Problem: a repeating task doesn’t help if the schedule has not repeating pattern.
The Solution: Combining a location service (here Foursquare) & IFTTT & RTM
What you'll need:
• Foursquare (probably also works with Android Location or IOS Location)
• IFTTT
• RTM
After setting up the accounts and activating the channels, you create a receipt with foursquare and your preferred email account. The basic idea: you log you current location, IFTTT triggers an email to RTM. Et voila, a location based action for RTM is created and with some Smart Add magic everything is already fine-tuned.

In my case this triggers, every time I log my work location, the action to get my brunch box out in the evening (so it's conveniently filled up by my wife the next morning). If I'm working from home or if I'm on a business trip it's not triggered
Surely with this setup many different scenarios may be created - let me know about your ideas!

Enjoy!