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.
My mom and sister are throwing my bridal shower 6 weeks before my wedding. I was planning on sending out my wedding invitations 10 weeks before the wedding (which I believe is a little on the early side) because they include hotel information, etc. This is obviously 4 weeks before the shower which also seems like the prime time that my mom and sister would be sending out shower invites.