How to ask for a raise?

I recently proposed, planned, and implemented a company-wide Security awareness workshop that has received nothing but positive feedbacks from the top brass to the mailroom clerk. How can I use this as a leverage during the annual employee evaluations scheduled in the next few weeks. This workshop I put together is usually outsourced to highly paid consultants, but I’ve worked on this on my off-hours and I even use my personal laptop to conduct the workshops.

My company is also going through a buy-out, so I walking on very thin ice here.

Please help.