Update README.md

Author: alanedelman

README.md

@@ -68,7 +68,7 @@ Take a look at [MIT Engaging](https://engaging-ood.mit.edu:8443/auth/realms/enga
 | 17 | 4/6/2026 | Monday | | Alan | [Optimizing Serial Code](https://book.sciml.ai/notes/02-Optimizing_Serial_Code/) Types in Julia [[7_ptypes.jl]](https://github.com/mitmath/18337/blob/master/lecture%2017/7_ptypes.jl) [[html]](https://mitmath.github.io/18337/lecture17/7_ptypes.html) [Threading](https://mitmath.github.io/Parallel-Computing-Spoke/notebooks/ThreadingNotebook.html) [[handwritten notes]](https://github.com/mitmath/18337/blob/master/lecture4/lecture_4_handwritten_2023.pdf) [[Serial Performance .jl]](https://github.com/mitmath/18337/blob/master/lecture4/serial%20performance.jl) [[Loop Fusion Blog]](https://julialang.org/blog/2017/01/moredots/) |
 | 18 | 4/8/2026 | Wednesday | | Evelyne Ringoot | [Programming GPUs](https://docs.google.com/presentation/d/15xJ-T_BkTjpAH5o31m9MfHVuXyjoyR6v0Zw1WC4onoc/edit?slide=id.p1#slide=id.p1) |
 | 19 | 4/13/2026 | Monday | | Alan | Matrix Multiply and Memory [Slides](https://docs.google.com/presentation/d/1PYBEPSc7uB0zpojgmQhY5bZTHzCevZ3cVfs_DSwaEfk/edit?usp=sharing) |
-| 20 | 4/15/2026 | Wednesday | | Alan | |
+| 20 | 4/15/2026 | Wednesday | | Alan (and Julian remotely)| |  Dagger 1 [Slides](https://docs.google.com/presentation/d/1PLl3b_Po5rn062myp-9MhdHwJtBFQHwisHgiEMalENM/edit?slide=id.g354a3f24b34_0_1503#slide=id.g354a3f24b34_0_1503), Dagger 2 [Slides] (https://docs.google.com/presentation/d/1anH0R-7UnkgG9NkaA6E60g4212UrVzkXb7TBadlqevM/edit?slide=id.p#slide=id.p)
 | | 4/20/2026 | Monday | Patriots Day | | |
 | 21 | 4/22/2026 | Wednesday | | Tamiko Thiel  | |
 | 22 | 4/27/2026 | Monday | | Class  |Final Project Presentations  |