Another potential pitfall with the Gift Alternative is whether that is instead of or in addition to a regular gift.
I was invited to a baby shower for which guests were asked to bring something for the baby's time capsule, to be opened when she turns ten. OK, kind of cute.
Unfortunately, this was ambiguous. Some people showed up with just something for the time capsule, others with that and a more traditional gift. Also, some of the time capsule gifts were rather fancy, such as an engraved silver keychain, whereas others were more like a TV Guide from the week the baby was born (clever, but not expensive).
Awkward it was.