From the event website:
"The event's collaborative, non-competitive atmosphere offers an alternate setting for students to explore the joys and power of mathematics with other kids and older mentors.
We provide the mathematics and mathematicians to work with the students on the activities. Please bring an adult to provide supervision of your children/students. Admission for kids is $10; supervising adults are free. If you can't afford the fee, there is a checkbox at the bottom of the form to waive it.
Registration at the door is $25.
If you have any questions, please contact us at firstname.lastname@example.org.
This event is sponsored by desJardins/Blachman fund and Stanford University's Pre-Collegiate Studies Program."