The colors you choose should go with the décor of your venue, or vice versa, to avoid clashing.
Make a list of everything you will need to bring with you on the big day. Gather everything in advance and put it in one spot so that you don't have to search for an essential item at the last minute.
Put together a basket of emergency items for the ladies' room at the reception. This includes things like hairspray, clear nail polish for stocking runs, and a mini sewing kit.