You can add a .ev3 file to an event after your athletes have declared. All you need to do is add the .ev3 file to the meet, then use QuickEntries to put your athletes into the desired events.
Click Events & Competition > Team Events from the left navigation menu.
Click [Edit] by the event to which you wish to add the ev3 file.
Under Step 3 of the Event Edit Screen, select Allow On-line Reg; Meet Manager/Meet Events file to allow On-Line meet entry.
Click the next radio button, Import Meet Events file below.
Click Browse...to locate and double-click the ev3 or zip file.
Athletes can pick their events by default. If you only want coaches to pick events, change the Allow Athletes to commit by Event? dropdown to NO, commit by Day/Session.
Click Save Changes.
Return to the Events page and click the Edit Commitment button.
Click the Committed Athletes tab.
You can use the QuickEntries to enter athletes into events.