I used Lucidpress.com and Pixabay.com for creating this poster.
Design thoughts:
I made sure the poster included photos which I used as a background for the conference topic name and the image of a classroom to show how important the teacher's role is in the classroom.
I used monochromatic color scheme to harmonize the images and the text.
I limited the text with one font using different sizes and styles (regular, bold and italic).