The description/requirements that you posed is too vague. You may try the event log of BPI Challenge 2011 (http://www.win.tue.nl/bpi2011/lib/exe/fetch.php?media=hospital_log.xes.gz) from a large hospital. Though it is a single event log, you can partition the log into subsets of homogenous cases and thereby obtain multiple event logs (all in the same field). For more information, please have a look at the following paper and report:
2. R.P.J.C. Bose and W.M.P. van der Aalst, "Analysis of Patient Treatment Procedures", Proceedings of the BPM 2011 International Workshops, volume 99, Part 2 of LNBIP, pages 165-166. Springer-Verlag, Berlin, 2012. http://www.win.tue.nl/~jcbose/JCBose_Aalst_LNBIP_BPIChallenge2011.pdf