My first balloon flight (there have been three more since this one) was at SOSA. The pilot arrived with his balloon on a trailer and asked permission to launch from our field. We could not allow him to launch with 30+ gliders still aloft, so while we waited for the traffic to subside, I gave the pilot and his wife rides in a glider. Afterward, he gave me and the tow pilot a ride in his balloon in return.
The picture here is from a flight from Kitchener in 1997.