Jennings Environmental Education Center, Route 528, Brady Township, will host Nature Detectives: Salamanders at 2 p.m. May 4. Registration is due by May 2, either by calling 724-794-6011 or online at www.apps.dcnr.state.pa.us/Calendar.

Moraine State Park will host the Glacier Ridge Trail Ultramarathon on Saturday. Visit www.glacierridgetrailultra.com. A watershed education teacher workshop will be held from 8 a.m. to 4 p.m. Saturday and April 26. Call 724-368-8811.