chore: Update appearances

Author: LekoArts

src/pages/appearances.mdx

@@ -13,6 +13,11 @@ Over the last couple of years I've given lightning & full-length talks at confer
 
 You can also find all slides in my [talks](https://github.com/LekoArts/talks/) repository.
 
+## 2026
+
+- 🎬 [Workshop: Build Multi-Agent Networks with Mastra](https://www.youtube.com/live/FNb2fL9WhQg)
+- 🎬 [Mastra 1.0 is here - everything new](https://www.youtube.com/live/vjx9_KfHimY)
+
 ## 2023
 
 - 📖 [Reliability Testing for Meta-Frameworks](https://reliability-testing-meta-frameworks.netlify.app) at [Front-End Test Fest 2023](https://applitools.com/front-endtestfest-june-2023/)