My BM's kept dragging their feet over the bachelorette thing, so I planned it myself and invited a few close friends and we went to the beach for the weekend.
I had a non-BM plan my friends shower. I don't think there is anything wrong with planning your own bachelorette party (obviously, since I planned my own, lol).
Are you close to your parents (distance-wise)? If yes, then perhaps have your Mom contact a BM and ask if they are going to be doing a shower or if she needs to include your friends as well. Having Mom step in should get them off their butts.