Keep an online database or spreadsheet with the names of all invitees and RSVPs. Use the same list to note gifts given and thank you notes written.
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.
Go through the timeline of the day carefully and make sure there is someone who is managing it and telling people where to go or what to do next.
Is your groom a member of the "Geek Squad?" Show his personality on your wedding cake with this mix and match figurine. Partnered here with our Cellphone Bride.