[dodgechargerfan]

You could always just find out, install up a test board and install them both and try it.

I gave this a quick try and found that Event Attendance breaks. The calendar entry comes up as a regular entry even though you click on the allow attendance options when creating the event. There is no link in the event entry to click to confirm attendance.

Even after uninstalling event forums, the entry stays broken. I even tried editing the event and un-checking the allow attendance checkbox and then editing it again to turn it back on and it doesn't come back..

Just to see if things were back to normal, I then entered in another test event after uninstalling Event Forums and things seem to be fine. Just that the entry made while Event forums was installed is still not right.

Hopefully, this is helpful information for you and I hope it might provide some insight into a possible solution. *crosses fingers and wishes the coder(s) all the best*