fix image links and add dates

SummerSprint2024/README.md

@@ -3,12 +3,23 @@
 This directory holds notes and planning documents for the Jetro Web
 Development Summer Sprint 2024.
 
+## Dates
+
+### Pre-planning and Preparation (virtually)
+
+Monday, July 8th through Wednesday, July 31st.
+
+### In Monrovia
+
+Monday, August 5th through Friday, August 16th.
+
+
 ## Jelkner's Flight Itinerary
 
 ### Washington to Monrovia
 
-![Jelkner DC to Monrovia](images/jelkner_jelkner_dc2monrovia.png)
+![Jelkner DC to Monrovia](images/jelkner_dc2monrovia.png)
 
 ### Washington to Monrovia
 
-![Jelkner Monrovia to DC](images/jelkner_jelkner_monrovia2dc.png)
+![Jelkner Monrovia to DC](images/jelkner_monrovia2dc.png)