We used Tito [1] to put on Longhorn PHP [2], and we were very happy with it! They're still small enough that they respond very quickly to requests for changes / fixes as well.
To clarify, Tito is event management software which the parent commenter used to organize the Longhorn PHP event. I thought this was some random spam before clicking through the links.
1) https://ti.to/ 2) https://www.longhornphp.com/