EveTAR test collection, the first Arabic freely-available Test Collection for multiple information retrieval tasks in Twitter. It supports Event Detection (ED), Ad-hoc search (AS), Timeline generation (TTG), Real-time summarization (RTS). EveTAR includes a crawl of 355M Arabic tweets and covers 50 significant events for which about 62K tweets were judged with substantial average inter-annotator agreement (Kappa value of 0.71). Besides the full collection (EveTAR-F), we provide four different subsets of EveTAR: (1) EveTAR-S: Random sample of 15M tweets (2) EveTAR-S.m: MSA tweets of the sample (3) EveTAR-S.d: Dialectal tweets of the sample (4) EveTAR-Q: Judged tweets only