WST 2023, FSCD 2023, 13th Intl. School on Rewriting (September 2022, Tbilisi), Confluence Competition, Intl. Workshop on Confluence (July, Paris), 28th Intl. Workshop on Functional and (constraint) Logic Programming (WFLP)(September 7th, 2020, on-line) 27th Workshop on Workshop on Functional and (Constraint) Logic Programming, WFLP 2019 (September 9-13, Cottbus) 4th Intl. Conf. on Formal Structure for Computation and Deduction, FSCD 2019 (June 24-30, Dortmund), Intl. Termination and Complexity Competition, associated with TACAS 2019, April 7, Intl. Termination Competition (Oxford, 13 July 2018), 26 Intl. Workshop on Functional and Logic Programming (WFLP) (Frankfurt, 6 September 2018), Workshop Haskell in Leipzig (with Hackathon) 26 - 28 October 2017, Intl. Workshop on Functional and Logic Programming (WFLP) (Würzburg, 19 - 22 Septemer 2017), Intl. Workshop on Rewriting Techniques for Program Transformations and Evaluation (Oxford, 8 Sept 2017), Intl. Termination and Complexity Competition (5-6 September 2017), Intl. School on Rewriting (Eindhoven, 3 - 7 July 2017), Leipzig Week of Declarative Programming (WLP, WFLP, HaL) (12 - 15 Sept 2016) Intl. Termination and Complexity Competition 2016, Intl. Workshop Rewriting Techniques for Program Transformations and Evaluation, Haskell in Leipzig (HAL) 10, 8th Intl. School on Rewriting (ISR 2015), Intl. Termination Competition 2015, 2nd Intl. Workshop on Rewriting Techniques for Program Transformations and Evaluation (WPTE 2015), 23rd Intl. Workshop on Functional and (Constraint) Logic Programming (WFLP 2014), 7th Intl. School on Rewriting (ISR 2014), Intl. Termination Competition 2014, 14th Intl. Workshop on Termination (WST), Hal-9, HaL-8, HART 2013, WST 2013, HaL-7, HaL-6, autOlat, ICFP Programming Contest 2010, HaL-5, HaL-4, WST 2009, Wissenschaftssommer 2008, WScT 2009, HaL-3.