| Sri Lankan New Year Celebration 2024 | 04/14/2024 8:00 am - 3:00 pm |
| Spring Out: Hillsboro Family Games | 03/19/2022 9:00 am - 12:00 pm |
| Spooktacular | 10/26/2024 3:00 pm - 8:00 pm |
| Spell The Tea: A Magical Tea Party | 10/31/2024 3:00 pm - 6:00 pm |
| Special Planning Commission Meeting | 03/22/2022 6:00 pm |
| South Hillsboro Area 2 Community Meeting | 04/28/2022 5:00 pm - 7:00 pm |
| Sold Out: Holiday Hustle 5k @ Lightopia | 12/09/2024 5:30 pm - 6:30 pm |
| SOLD OUT: Demet Tuncer and the United Thracians | 03/17/2023 7:30 pm - 9:30 pm |
| SOLD OUT - OMSI Science Pub: Hillsboro | 02/12/2024 7:00 pm - 9:00 pm |
| SOLD OUT - Alasdair Fraser & Natalie Haas | 09/30/2022 7:30 pm - 9:30 pm |
| Solar Now! University Conference 2014 | - |
| So, You Want to Publish a Picture Book with Hannah Holt | 03/07/2023 6:30 pm - 8:00 pm |
| So You Want to be a Teen Volunteer at the Library | 02/18/2023 12:30 pm - 2:00 pm |
| Smokey Bear's 80th Birthday Storytime Celebration | 08/09/2024 10:15 am - 11:15 am |
| Sister City Info Night | 11/17/2016 7:00 pm - 8:00 pm |
| Simple Science: Flashlights | 03/17/2024 1:30 pm - 2:30 pm |
| Simple Science | 03/05/2023 3:30 pm - 4:30 pm |
| Simple Science | 03/19/2023 1:30 pm - 2:30 pm |
| Simple Science | 11/19/2023 1:30 pm - 2:30 pm |
| Simple Science | 11/05/2023 3:30 pm - 4:30 pm |
