First im so sorry for your loss..but its your mom you should honor her every and any which way you choose! Ive seen in pinterest that people have put a picture on the seat to honor loved ones who have passed..maybe you could bring her urn and do that. Thrn maybe play a song at your reception that she loved. But dont rush the replanning process..dont let anyone pressure you! We're all here for you..let us know what we can do to help!!