Change plans from opening weekend?

4 of us are coming from Canada for Oktoberfest. Currently we’ve planned on being in Munich Sept 18, 19, 20 and again on Oct 2nd. We’re traveling around Europe between that time. However we’ve read some stuff about opening weekend not being as enjoyable due to limited access to seats (almost impossible to get I’ve seen?). Is it worth it to try to adjust all of our accommodations and dates to push the dates we’re in Munich to Sept 29, 30, Oct 1, 2?

Thanks!