The ladies in my FI's family are determined to throw all three of these parties for me. I'm shy and I don't like to be the center of attention and I feel uncomfortable receiving gifts without reciprocating especially since they are all coming to the wedding and presumably will be bringing gifts then too. FI and I also have more than what we need after combining our households and we are constantly de-cluttering/downsizing.
Our engagement is short (5 months), and our actual wedding plans small, intimate and simple (a ceremony and a sit-down dinner, no wedding party). These 3 pre-wedding parties are sounding increasingly elaborate and I'm afraid my actual wedding may be a disappointing climax after all that built-up anticipation. I also don't want them to spend money on us like this. FI and I don't care enough to spend a lot on our own wedding so it feels like we're somehow taking advantage of their generosity. Neither he nor I know how to convey this without sounding ungrateful.