website: Update gem5 workshop isca '23 page

* Note CFP is now closed
* Bobby R. Bruce's keynote is now 25 minutes in length.

Change-Id: I43ca164aafcf91831d2de7b08f7749f236f75206
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/70839
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/_pages/events/isca-2023.md b/_pages/events/isca-2023.md
index aac42f2..c7afbb6 100644
--- a/_pages/events/isca-2023.md
+++ b/_pages/events/isca-2023.md
@@ -6,10 +6,7 @@
 We are happy to announce the gem5 Workshop, to be co-located with [ISCA 2023](https://iscaconf.org/isca2023/), in Orlando, Florida.
 
 The gem5 Workshop is be an opportunity for members of the gem5 community to give presentations on their contributions to gem5 and gem5-related research.
-This year's workshop will start with a 45 minute keynote by Dr. Bobby R. Bruce, titled "gem5 v22, v23 and the future", and will continue with presentations and discussion panels on gem5 topics.
-
-**We are currently soliciting presentation proposals.
-If you wish to present your work at the gem5 Workshop then please consult our [Call For Presentations](#call-for-presentations) section**.
+This year's workshop will start with a 25 minute keynote by Dr. Bobby R. Bruce, titled "gem5 v22, v23 and the future", and will continue with presentations and discussion panels on gem5 topics.
 
 ## Key Dates
 
@@ -20,6 +17,8 @@
 
 ## Call for Presentations
 
+**Note:** The call for presentations is now closed.
+
 The gem5 simulator is an open-source platform that enables the modeling and simulation of computer systems at different levels of abstraction, including processor, memory hierarchy, and interconnects.
 It is widely used in academia and industry for research, education, and design space exploration.
 Now on its 5th iteration, the gem5 Workshop gives community stakeholders a chance to present their contributions and ideas, as well as engage in discussion with the wider community.