Are you looking for a source of drawing prompts? While we can't yet meet up for a sketch outing, we can still draw together. Gabi Campanario started Urban Sketchers on Flickr and there still is a global USk group there. Each Monday a weekly theme is posted. I've done this, on and off, since 2012. It is found in the discussions section of the group: https://www.flickr.com/groups/urbansketches/discuss/
Even if you aren't on Flickr, you can share your sketch of the weekly theme on our Instagram at #uskseattle or Facebook groups. There's also no reason why you can't explore past weekly themes and post your sketches.
Here is my very first weekly theme sketch, which was boats. I hadn't done any drawing in about 40 years at that point! (Throw back to Stephanie Bower's challenge from USk Talks!)
This week's theme is "your nearest public transport stop ". I did a dashboard sketch (thank you, @steve_reddy for the term) from the safety of my car. The parking lot behind the bus stop is for a gas station, coffee stand, and a food truck. It was just a little too busy for me to want to sit outside to draw.