What a great opportunity for growth! After playing alone for years I (timidly) jumped at the chance to jam with other players at a big open area. We would each jam in a given key and I was able to explore runs up and down the positions. I will sometimes play around the 1-4-5 chords and then just stay on the key chord as a switch up. It helped so much with my timing etc. You have a wonderful opportunity, soak it up!