Consider praying one these prayers that Paul prayed:
"...that you may be filled with the knowledge of His will in all spiritual wisdom and understanding, so as to walk in a manner worthy of the Lord, fully pleasing to Him, bearing fruit in every good work and increasing in the knowledge of God." Colossians 1:9-10
"..that our God may make you worthy of His calling and may fulfill every resolve for good and every work of faith by His power, so that the name of our Lord Jesus may be glorified in you, and you in Him, according to the grace of our God and the Lord Jesus Christ." 2 Thessalonians 1:11-12
I like the second prayer for this context. Events like this conference can have a very high impact, providing an opportunity for students to "place a stake in the ground" on a signficiant life or obedience decision. Pray that the Lord would enable them to carry these out after leaving the conference!
Have a great weekend!