add dates and speakers to about page

Author: NinaWie

_pages/about.md

@@ -30,7 +30,9 @@ In the past years, the summer school was supported by [Universitätsgesellschaft
 
 ### Key dates
 
-- 2025/05/01 (tentative): Registration opens
+- 2025/05/01: Registration opens
+- 2025/06/30: Deadline for travel grant applications
+- 2025/07/15: Registration deadline (if there is enough space, further registrations will be considered on a rolling basis)
 - 2025/09/01: Start of the summer school!
 
 ### Speakers
@@ -39,3 +41,6 @@ In the past years, the summer school was supported by [Universitätsgesellschaft
 - Martin Hebart (University of Gießen, MPI Leipzig)
 - Loes van Dam (TU Darmstadt)
 - Alexander Gail (University Göttingen)
+- Katharina Lüth (University Osnabrück)
+- Vildan Salikutlik (TU Darmstadt)
+- Ute Schmid (University of Bamberg)

_pages/registration.md

@@ -39,7 +39,7 @@ The event is targeted mainly at bachelor's and master's students in cognitive sc
 
 ### Travel grants
 
-We give out a limited number of travel grants. Everyone who does not live in Darmstadt is eligible; however, priority will be given to participants traveling from abroad. If you would like to apply, please register before June 31st and complete the corresponding section in the registration form.
+We give out a limited number of travel grants. Everyone who does not live in Darmstadt is eligible; however, priority will be given to participants traveling from abroad. If you would like to apply, please register before June 30th and complete the corresponding section in the registration form.
 
 ### Accommodation in Darmstadt