Hi Stephanie, Good question. Not sure if can give exact numbers off the bat, especially for those further back. The general ballpark was around 50. I cc. SOC which contains Francesca, Thorsten and Michael, who can fill in some of the blanks better maybe for more recent ones they hosted. I paste below my estimates for each. If anyone else in SOC has better recollections than me please correct the below. I can get more precise numbers further back with a bit of work and fishing, but would be effort and require me tracking down people no longer in field and/or working for me anymore. I will try and do so, as this information can be useful in future for presentations and applications (but not sure how quick I can get during this time in August) – will write Thomas, Daniele, Celia, Michaela & Anita in this regard. Let me know if these ballpark numbers are ok for you for now and for sake of this application? (maybe ok to give a range in each one, if it is an open text form, like e.g. 30-40 or 100-110). All the best, Kareem Meeting 1: closer to 30 (think was a little over) Meeting 2: Perugia was more than twice as large since also had non-BioBrillouin combined so closer >100 I would say Meeting 3: In Porto was I believe about 50 Meeting 4: was online via Exeter. Francesca do you have number here? Meeting 5: Online via Vienna. Maximum at any one time was 110 in room (attendance was higher because free and online) Meeting 6: I believe Thomas mentioned around 50 Meeting 7: Michael correct me if I am wrong, but I think this was also around 50? Meeting 8: Thorsten, I believe you mentioned around 70? From: Stephanie Möllmert <stephanie.moellmert@mpl.mpg.de> Date: Wednesday, 13. August 2025 at 21:51 To: Kareem Elsayad <kareem.elsayad@meduniwien.ac.at> Subject: Re: [EXTERN] [Soc25] 9th International BioBrillouin Conference | November 2025 - Optica Hi Kareem, would you please let me know how many attendees the BioBrillouin Conferences had in the previous years? o BioBrillouin Meeting 1 (Vienna, Austria, 2017): o BioBrillouin Meeting 2 (Perugia, Italy, 2018): o BioBrillouin Meeting 3 (Porto, Portugal, 2019): o BioBrillouin Meeting 4 (Exeter, UK, 2020): o BioBrillouin Meeting 5 (Online, 2021): o BioBrillouin Meeting 6 (Lyon, France, 2022): o BioBrillouin Meeting 7 (Dublin, Ireland, 2023): o BioBrillouin Meeting 8 (Trondheim, Norway, 2024): I am completing the questionaire/proposal from Optica (https://www.optica.org/events/meeting_opportunities/meeting_grants/) and would send it to Gerd Leuchs directly. However, the submission needs to be before the 15th of each month. Thank you! Best, Stephanie On 13.08.25 17:26, Kareem Elsayad wrote: Hi Stephanie, What about putting the other sponsors (not just Optica - assuming they support) on poster? Maybe I misunderstand, would Optica then not serve as a Silver/Gold/Platinum sponsor but something else? (if so, what would they potentially offer and want in return?) All the best, Kareem On 13.08.25, 16:57, "Stephanie Möllmert via Soc25" <soc25@biobrillouin.org <mailto:soc25@biobrillouin.org>> wrote: Dear all, the poster has been approved by our PR team and would be ready to go. Iâ•˙ve gone through it carefully, but Iâ•˙d appreciate it if you could give it a quick glance and let me know if you spot any typos or mistakes, or any design issues. Iâ•˙ll fix them, and we can add Optica if that works out. Thanks so much! Cheers, Stephanie -- Dr. Stephanie Möllmert Research Group Leader Max-Planck-Zentrum für Physik und Medizin Cell Physics Division Kussmaulallee 2 91054 Erlangen Germany Max Planck Institute for the Science of Light Cell Physics Division Staudtstr. 2 91058 Erlangen Germany Phone: +49 (0) 9131 8284530 Email: stephanie.moellmert@mpl.mpg.de Homepage: www.gucklab.com