You may wish the party success. But I think, you wish someone success in his new career, exam, etc.
Wishing luck to someone'syour endeavors... ? I'd rather wish you luck in all your endeavors. Here's why: The endeavors are yours, directly dependent upon yourself, your state of being, circumstances, etc. If I wished you luck (better circumstances in your favour), you could win or become more successful.
Note: A google hit may bring up all that in current usage (both right and otherwise, because cyberspace is free-for-all and not subject to any control). However, it's up to us to choose the ones which correspond to our personality and expression.