You can! When you add a participant to your event, you can select that you want to pay for that participant. You do not need to pay for all participants. If you pay for a participant, they will still need to login and checkout on their own account. This is so we can collect their credit card information, shipping address, and sizing. More information about this is at checkout for $0.
If you'd like to pay a partial dollar amount for participant orders, contact our Customer Care team for assistance.