People seem to go to great lengths to be able to say the blessing on blossoming fruit trees. I'm not aware of any such efforts made to observe other phenomena that would require a blessing, such as comets, or even an effort to find a new fruit to say a blessing on (other than Rosh Hashana, which is for a specific reason having nothing to do with the fruit).
Why does this particular blessing get such efforts made to enable people to say it?