But these events take a lot of work and I'd been asked to prepare the powerpoint presentation and handout materials that would tie everything together.. a big job, especially with my normal ministry and family commitments to maintain.
Graphic River is a marketplace for design templates, textures, vectors, icons, infographic elements, images and yes, Powerpoint or Keynote templates. Yes, you do have to pay for them but prices start from $1 and are based on the complexity, quality and use of the file. (They do offer a monthly free file.)
You can start looking for Powerpoint/keynote templates here and prices are around $12-$15 for about 30-50 unique slides and usually contain 2 versions. When you consider the saving of your time and the professional end-result, it's well worth the money.
You can also find links to Photodune, Audiojungle, Videohive, Themeforest and more providing other graphic and audio resources. And.. if you want to learn more and gain some extra creative skills, you can find plenty of tutorials, ebooks and courseshere.