The 30th International Conference on Head-Driven Phrase Structure Grammar will be held in a hybrid format on 07 July - 08 July 2023 at the University of Massachusetts Amherst, the venue of the LSA Linguistic Institute 2023. The HPSG 2023 conference will be a two-day main conference (07 July - 08 July), which will be followed by a one-day (09 July) workshop on ellipsis (Experimental and Corpus-based Approaches to Ellipsis). **Schedule for the Main Conference** The program of the conference and workshop is attached to this email. Notice that the program is subject to last-minute changes. Please consult the webpage: https://www.acsu.buffalo.edu/~fabiolah/hpsg23/schedule_mc.html **Registration** Please register before July 6th: https://activities-ubf-buffalo.nbsstore.net/hpsgellipsis-workshop-registrati... <https://activities-ubf-buffalo.nbsstore.net/hpsgellipsis-workshop-registration> Registration for the conference is mandatory for participation on site or online. **Registration fees**$0 for LSA participants $50 for students $80 for non-students **Contact information** Local Organizing Committee Chairs: Gabriela Bîlbîie (University of Bucharest) Fabiola Henri (University at Buffalo) Program Committee Chair: Elodie Winckel (Friedrich Alexander University Erlangen-Nuremberg) For questions about the logistics of the conference, please contact the local organizers (Gabriela Bîlbîie and Fabiola Henri) at hpsg2023@gmail.com <mailto:hpsg2023@gmail.com>.