Update lecture topics and dates in README

Author: alanedelman

README.md

@@ -48,8 +48,8 @@ Take a look at [MIT Engaging](https://engaging-ood.mit.edu:8443/auth/realms/enga
 |---|---|---|---|---|---|
 | 1 | 2/2/2026 | Monday | | Chris | [Intro to SciML, PINNs][3] |
 | 2 | 2/4/2026 | Wednesday | | Chris | [Forward mode automatic differentiation][8] |
-| 3 | 2/9/2026 | Monday | | Alan | Writing fast single core code |
-| 4 | 2/11/2026 | Wednesday | | Alan | Single core code, continued |
+| 3 | 2/9/2026 | Monday | | Alan | Looking at Forward Mode in other ways |
+| 4 | 2/11/2026 | Wednesday | | Alan | MITs Engaging Supercomputing |
 | | 2/16/2026 | Monday | Presidents' Day | | |
 | 5 | 2/17/2026 | Tuesday | Monday Schedule | Chris |  Reverse mode automatic differentiation |
 | 6 | 2/18/2026 | Wednesday | | Chris | Adjoint methods |