vsquared1011's Blue wedding

My fiance and I are both graduating from college next weekend and we have been engaged for a month now. My mom was planning on throwing us a graduation party anyway, but now that we are engaged she wants to make it a combo party. The grad. open house was going to be really informal (swimming, bonfire, etc.), but if it's going to be an engagement party too I want it to be a little less informal and I'm not sure how to go about that. None of our college friends are at the same point in their lives right now, so while I know they're happy for us, I don't think any of them would be interested in attending an engagement party...especially since there will be no alcohol(neither of our parents drink). Also, I don't want anyone to feel like they need to bring gifts or anything. Should we just not do the engagement party? I really never planned on having one anyway, but my mom really wants to. Has anyone done anything like this before or do you have any ideas?