As President of SIAM, I organized a regular mentor lunch that we started to run every semester. What motivated me was noticing that undergraduates with whom I spoke were routinely unaware of their career options. It was completely unclear what courses they should take because they had a hard time connecting what they liked to possible career paths. Many did not know that graduate school could be paid for! The course descriptions were not particularly helpful since they contained jargon that was unfamiliar to students.
It was fairly straight-forward to secure funding (for a couple dozen box lunches), and set up a time for professors and graduate students to be available for walk-in consultation/mentorship for undergraduate math majors and minors.