diff --git a/src/Utils.H b/src/Utils.H
index fbaaef3..6ce895b 100644
--- a/src/Utils.H
+++ b/src/Utils.H
@@ -94,8 +94,13 @@ struct ICType {
 /*! \brief Namespace with utility functions */
 namespace Utils {
 
+/*! \brief Read in test parameters in #ExaEpi::TestParams from input file */
 void getTestParams(ExaEpi::TestParams& params, const std::string& prefix);
-}
+
+/*! \brief returns whether day i is a work day */
+bool isWorkday(int i);
+
+} // namespace Utils
 } // namespace ExaEpi
 
 #endif
diff --git a/src/Utils.cpp b/src/Utils.cpp
index ee38958..bc93f73 100644
--- a/src/Utils.cpp
+++ b/src/Utils.cpp
@@ -19,7 +19,6 @@
 using namespace amrex;
 using namespace ExaEpi;
 
-/*! \brief Read in test parameters in #ExaEpi::TestParams from input file */
 void ExaEpi::Utils::getTestParams (TestParams& params, /*!< Test parameters */
                                    const std::string& prefix /*!< ParmParse prefix */) {
     ParmParse pp(prefix);
@@ -83,3 +82,8 @@ void ExaEpi::Utils::getTestParams (TestParams& params, /*!< Test parameters */
 
     pp.query("fast", params.fast);
 }
+
+bool ExaEpi::Utils::isWorkday (int i) {
+    // right now we work on days 0-4, rest on 5-6
+    return ((i % 7) < 5);
+}
diff --git a/src/main.cpp b/src/main.cpp
index 3b8a7bd..4bdb5ba 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -496,10 +496,13 @@ void runAgent () {
                 pc.moveAirTravel(censusData.unit_mf, air, censusData.demo);
             }
 
-            // Typical day
-            pc.morningCommute(mask_behavior);
-            pc.interactDay(mask_behavior);
-            pc.eveningCommute(mask_behavior);
+            // Process daytime / nighttime interactions.
+            // Only do daytime interactions on weekdays
+            if (ExaEpi::Utils::isWorkday(i)) {
+                pc.morningCommute(mask_behavior);
+                pc.interactDay(mask_behavior);
+                pc.eveningCommute(mask_behavior);
+            }
             pc.interactEvening(mask_behavior);
             pc.interactNight(mask_behavior);