Friends and family of Rajeev Motwani, a Stanford University professor who was well-known for being an early investor in Google (s goog), are planning to host a memorial service followed by a concert on Sept. 25. Rajeev drowned in his swimming pool earlier this year. Just as he helped me, Rajeev assisted thousands of people in Silicon Valley — whether it was through advice, connections and sometimes money.

We are going to celebrate Rajeev’s life on Sept. 25 at Stanford. You can RSVP here by Sept. 21, 2009. The memorial will start at 3:30 p.m. PDT, followed by a small reception at the Littlefield Center Courtyard and a concert by Indian Ocean at the Frost Amphitheater.