When you have guests staying for more than two hours, you can do them a solid and let them use a visitor parking pass to avoid parking tickets in your RPP area (residential parking permit). Passes are free, one per households with existing RPP.
Registration for a visitor pass opens on December 1st. Go to the VPP website to register.
Here's info from DDOT on how to get yours:
The District's Visitor Parking Pass (VPP) Program allows guests of eligible District residents to park for more than two hours on residential parking permit zone blocks.
2015 passes expire December 31, 2015. Registration for 2016 passes begins Tuesday, December 1, 2015. Passes are free, and one per household is available for residents on eligible Residential Permit Parking (RPP) zone blocks in Wards 1, 3, 4, 5, 6, 7, and 8, as well as ANC 2F.
Residents may register for the 2016 VPP at vpp.ddot.dc.gov/vpp/ or by calling (202) 671-2700.
Temporary Visitor Parking Permits (15-day) can also be obtained at an Metropolitan Police Department station in the ward in which the resident resides.
A VPP does not waive the requirement to register a vehicle in the District after 30 days of establishing residency or seeking Resident Out-of-State Auto exemption. Each pass is tracked and assigned a unique address identifier with a Quick Reference (QR) code to help minimize fraud and misuse. Residents who live on a commercial zone block are not eligible and neither are those with non-residential address types.
For more information, go to ddot.dc.gov/page/visitor-parking-passes or call (202) 671-2700.