Much of this movement is to regulate the contents of the cell. This includes bringing material into the cell from the extracellular environment or the plasma membrane (endocytosis) or releasing material made within the the cell to the outside (exocytosis).
It really is an easy project...it just takes a little time. All and all, it took me about 6-8 total hours to make 4 bouquets, 10 bouts (my mom made those though) and about 15 centerpieces. I made two bouquets the day before our wedding and the other two the day of the wedding.
Preferably, send your gift to the bride before the wedding or to the couple soon thereafter. In some regions gifts are brought to the reception and placed on a special table. Contrary to a current rumor that you have a year to send a gift, it really should be sent soon after you receive your invitation or, on the outside, within three months of the wedding.