No, not really. You can use the CUSTOM selection in Repeat, but there must be some pattern. There is no way to just enter in a series of dates to be the repeating event.

While this will not relate the events, you can select the first event (do not open the details, just select it on the Month/Week/or Day view), copy it (CMD-C) and then select the date to which you wish to paste a copy (CMD-V). Make sure not to copy anything else until you have pasted the event into all of the dates you want.

Hope this helps.