Create MultiSumm task for multimodal summarization

multisumm added

Author: cmihaigabriel

_editions/2026/tasks/multisumm.md

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+---
+# static info
+layout: task
+year: 2026
+hide: false
+
+# required info
+title: "MultiSumm: Multimodal summarization of multiple topically related websites"
+subtitle: MultiSumm
+blurb: "Participants are provided with links to multimodal web content from several cities listing food sharing initiatives (FSIs) in each city. For each city, participants are tasked with creating a multimodal summary of the 
+FSI activities in the city that satisfy specified criteria. Evaluation will explore the use of emerging LLMs-based methods in automated assessment of multimodal multi-document summarization."
+---
+
+#### Task description
+
+The goal of the task is to explore the creation of multimodal summaries from multiple multimodal content items.
+
+Please watch here for an updated description. In the meantime, please see [the previous edition](https://multimediaeval.github.io/editions/2025/tasks/multisumm/) for more information. The task will build on last 
+year’s task, but with links to new data.
+