Colchester half marathon

Has anyone run the marathon before and can give any tips on here to get my family to park for when I finish? 🙃 I know there’s loads of road closures and they won’t be there at the start so I’m struggling to find where’s best?

I also have no idea what to do on the day (I’ve signed up for pure vibes and insanity) so if anyone’s done it and can let me know thank you :(((( 😂