You can report this as line 21 of the Form 1040 Misc Income (with or without a 1099Misc)
Click on “Take me to my return” button.
Click on Federal tab (left-hand side of screen).
Click in Wages and Income (near top of screen)
Scroll down to Less Common Income.
Click on Start next to Miscellaneous Income
Click on Other reportable income.
Follow the questions, and enter speaking engagement and $150.