Hello Quaqmire, Someone who bums programs at weekends is a weekend tweaker. This person changes programs or plans for a weekend slightly and makes them highly efficient and more enjoyable.

This example from the net will give you an idea of using this term as 'planning your weekend' ' I'm back again, and asking you to please help us tweak our first trip to New York City. We will be there Easter Weekend (Thurs-Mon). The first couple of days will be just my 18 yr old daughter and me, so we're hoping to get the shopping out of the way then. It looks like mostly I need help with restaurants. Some we'd like to try, if they're near anything we have planned, are: Shake Shack/Ellen's Stardust Diner/Roberto Passons?' We like are pretty simple eaters, nothing fancy necessary. Would love your ideas!

Tweak means to adjust/to change.A weekend tweaker maybe means a person who can provide a diffrent plans for your weekend.