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This paper is devoted to detecting social, real-world events from the sharing images/videos on social media sites like Flickr and YouTube. The fast growing contents make the social media sites become gold mines for social event detection, but we still need to overcome the challenge of processing the associated heterogeneous metadata, such as time-stamp, location, visual content and textual content. Different from the traditional early or late fusion with different types of metadata, we represent them into a star-structured $K$-partite graph, that is, social media itself is regarded as the central vertices set and different types of metadata are treated as the auxiliary vertices sets which are pairwise independent with each other but correlated with the central one. Based on this graph, Social Event Detection with Robust High-Order Co-Clustering (SED-RHOCC) algorithm is proposed and it includes two steps: 1) coarse event detection, 2) clusters and samples refinement. In the first step, by revealing the inter-relationship on the constructed star-structured $K$-partite graph and the intra-relationship within some metadata sets such as time-stamp, we co-cluster social media and the associated metadata separately and iteratively to avoid information loss in early/late fusion. After that, a post process is utilized to refine the clusters and social media samples in the second step. MediaEval Social Event Detection Dataset [1] and its subset are selected to demonstrate the effectiveness of our proposed approach in handling the datasets with and without non-event samples.