When I was a very new quilter I joined a very small guild. The local Make a Wish people asked the guild to make a quilt that they could auction for funds. A few very experienced quilters agreed to work on the quilt, and I joined the group for the learning experience. One of the ladies in the guild had a pattern from a magazine that we agreed would work, but it was for a smaller size than we had been asked to make. We all went together to a fabric shop and picked out fabrics. None of the very experienced quilters had bothered to figure out how much fabric we would need for the larger version of the quilt, so we bought much more than was needed. Luckily the blocks used only squares and rectangles, but the setting was on point so that required setting triangles. It was clear by now that no one had figured out how this group project would work. I was the newest quilter, but I was somehow tasked with figuring out how many blocks we needed, how many squares and rectangles of each fabric, etc. As I recall, we got together and a couple of people cut the pieces and I divided them into baggies for each block, then the baggies were distributed, along with copies of the directions, to 5 or 6 guild members. I do not know how this happened, but somehow I was tasked with sewing the blocks together. And what a great learning experience that was! Few of the women had produced blocks of the same size. One set of blocks was so poorly made that I had to take them apart and reconstruct them. (I realized later that one of the very experienced quilters was unable to see very well.) I couldn't complain to the guild members about the problems putting this quilt together, because several of them had made the blocks. I think I must have re-made more than half the blocks. But it was finally done, someone else quilted it, and it was auctioned by Make a Wish.
So to answer your question - never again will I volunteer to participate in a group quilt, especially if there's the slightest possibility that I would have to put the blocks together.
On a happier note, years later the guild had a rummage sale, and I purchased the leftover fabric from that quilt. I added some fabric from stash and used the same pattern to make a queen size quilt.