Yes, PyCon2005 falls during Holy Week. Fear not, there are some interesting-looking worship possibilities nearby. I'm not a local, it's based totally on websurfing.
Map
[http://maps.yahoo.com/maps_result?zoomin=yes&name=&ed=k6KNr.p_0TrXjG0p2sEfdNi11S2lZ3Y4lFsxuJcnSGrNTZp9Rz3YOz__fgJKem6TNGOioBY5upKN2ZmAoNH4prezJSl7TOR60zzCIL4SP6k4&state=DC&csz=Washington%2C+DC+20052-0001&ds=n&uzip=20052&mag=2&desc=&country=US&dma=511&cat=comm&resize=s&trf=0&rezoom=1&.intl=us&compass=&pan_x=0&pan_y=0&panable=1&BFKey=plw#mapcontent Yahoo! Map of nearby places of worship]
Their websites (by proximity to Cafritz)
[http://www.gwhillel.org/site/PageServer?pagename=HomePage Hillel] (Jewish)
[http://www.stmarysfoggybottom.org/ St. Mary's] (Episcopal/Anglican)
[http://www.westernpresbyterian.org/ Western Presbyterian]
[http://www.theunitedchurch.org/ The United Church] (United Church of Christ and United Methodist) (no German services that week - "aber schade!")
[http://www.stpauls-kst.com/ St. Paul's] (Episcopal)
[http://www.parishes.org/stephenmartyr.html St. Stephen Martyr] (Catholic) (not a reference to the PyCon chair) (I think)
[http://www.stmatthewscathedral.org/ St. Matthew's] (Catholic)
Wednesday worship
6 AM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
6:45 AM: Angelus & Morning Prayer at [http://www.stpauls-kst.com/ St. Paul's]
7 AM: Low Mass at [http://www.stpauls-kst.com/ St. Paul's]
7 AM: Mass at [http://www.stmatthewscathedral.org/ St. Matthew's]
7:30 AM: Morning Prayer at [http://www.stmatthewscathedral.org/ St. Matthew's]
8 AM: Mass at [http://www.stmatthewscathedral.org/ St. Matthew's]
11 AM: Confessions at [http://www.stmatthewscathedral.org/ St. Matthew's]
11:30 AM: Sacrament of Penance at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
12 PM: Low Mass at [http://www.stpauls-kst.com/ St. Paul's]
12 PM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
12 PM: Mass at [http://www.stmatthewscathedral.org/ St. Matthew's]
5:30 PM: Devotions at [http://www.stpauls-kst.com/ St. Paul's]
5:30 PM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
5:30 PM: Mass at [http://www.stmatthewscathedral.org/ St. Matthew's]
5:45 PM: Angelus & Evening Prayer at [http://www.stpauls-kst.com/ St. Paul's]
6 PM: Dinner at [http://www.westernpresbyterian.org/ Western Presbyterian]
6 PM: Low Mass at [http://www.stpauls-kst.com/ St. Paul's]
6:50 PM: Discussion at [http://www.westernpresbyterian.org/ Western Presbyterian]
7:30 PM: Tenebrae at [http://www.stmatthewscathedral.org/ St. Matthew's]
8 PM: Tenebrae at [http://www.stpauls-kst.com/ St. Paul's]
Thursday worship
6 AM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
9 AM: Morning Prayer at [http://www.stpauls-kst.com/ St. Paul's]
9 AM: Morning Prayer at [http://www.stmatthewscathedral.org/ St. Matthew's]
9 AM: Confessions at [http://www.stmatthewscathedral.org/ St. Matthew's]
11 AM: Mass of the Lord's Supper at [http://www.stmatthewscathedral.org/ St. Matthew's]
6 AM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
9 AM: Morning Prayer at [http://www.stpauls-kst.com/ St. Paul's]
9 AM: Morning Prayer at [http://www.stmatthewscathedral.org/ St. Matthew's]
9 AM: Confessions at [http://www.stmatthewscathedral.org/ St. Matthew's]
11 AM: Mass of the Lord's Supper at [http://www.stmatthewscathedral.org/ St. Matthew's]
12 PM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
12 PM: Solemn Mass Lord's Supper at [http://www.stmatthewscathedral.org/ St. Matthew's]
5 PM: Confessions at [http://www.stpauls-kst.com/ St. Paul's]
5:30 PM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
5:30 PM: Adoration of the Blessed Sacrament at [http://www.stmatthewscathedral.org/ St. Matthew's]
5:45 PM: Evening Prayer at [http://www.stpauls-kst.com/ St. Paul's]
6 PM: Communion and Tenebrae at [http://www.westernpresbyterian.org/ Western Presbyterian]
6:30 PM: Solemn Mass and Procession at [http://www.stpauls-kst.com/ St. Paul's]
9:45 PM: Night Prayer at [http://www.stmatthewscathedral.org/ St. Matthew's]
All Night: Vigil at [http://www.stpauls-kst.com/ St. Paul's]
Friday worship
6 AM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
6:30 PM: Solemn Liturgy of the Day at [http://www.stpauls-kst.com/ St. Paul's]
9 AM: Morning Prayer at [http://www.stpauls-kst.com/ St. Paul's]
9 AM: Morning Prayer at [http://www.stmatthewscathedral.org/ St. Matthew's]
11 AM: Confessions at [http://www.stmatthewscathedral.org/ St. Matthew's]
12 PM: Service at [http://www.westernpresbyterian.org/ Western Presbyterian]
12 PM: Stations of the Cross, with Meditations at [http://www.stpauls-kst.com/ St. Paul's]
12 PM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
12 PM: choral meditations at [http://www.stmatthewscathedral.org/ St. Matthew's]
1 PM: Liturgy of the Lord's Passion at [http://www.stmatthewscathedral.org/ St. Matthew's]
4 PM: Liturgia de la PasiĆ³n at [http://www.stmatthewscathedral.org/ St. Matthew's]
5 PM: Confessions at [http://www.stpauls-kst.com/ St. Paul's]
5:30 PM: Mass at [http://www.parishes.org/stephenmartyr.html St. Stephen's]
5:45 PM: Evening Prayer at [http://www.stpauls-kst.com/ St. Paul's]
6 PM: Shabbat services and dinner at [http://www.gwhillel.org/site/PageServer?pagename=HomePage Hillel]
6:30 PM: Solemn Liturgy at [http://www.stpauls-kst.com/ St. Paul's]
7:30 PM: Stations of the Cross at [http://www.stmatthewscathedral.org/ St. Matthew's]