What's one of the major mistakes couples make when planning their wedding reception?  Forgetting their guests at their wedding reception.  Sure, nearly everyone remembers the guest list, the seating chart, the champagne toast, etc., but we're talking about something more fundamental.  Planners at the reception halls call it "bride worship", and it's the overriding notion that "this day is all about me".  That's very true, your guests are coming to celebrate your new union.  But they are your guests, and it's your responsibility to plan for their comfort.  Sometimes it means not choosing your favorite dish as the main course, but something more guests are likely to enjoy.  If you're having having your reception in a location that doesn't have many (such as outdoors or a private home), will there be enough bathrooms, changing stations, or places to relax?  Do any of your dishes contain allergans, such as peanuts, that might send a guest to the hospital?

Couples who haven't planned a dinner party are more likely to overlook some of this.  We're not talking about a "come over, hang out, and we'll order some pizza" party, but one where you plan and prepare the meals and entertainment.  If you haven't planned a party like this, it might make a good dry-run for your reception to do so.  Perhaps have both sets of parents over at one house, and the both of you pland and prepare the meals.

In the end, it is your day--a celebration of you--but it is also your responsbility to ensure the comfort of those who celebrate with you.  Congratulations, and have fun!