Here's how to have fun with the little ones this weekend:

Dino art

It's nice to think that if the dinosaurs had survived that comet (or meteor, or earthquake, or visit from the Rigelian Empire, or whatever did them in) and continued to coexist with us, we'd be pals.

That's part of the appeal of "Dinotopia," artist and author James Gurney's delightful series about a 19th-century explorer visiting an island where gentle humans and smart dinos share an idyllic life. The other appealing aspect is Gurney's gorgeous, detailed paintings for the books. An exhibit of his work, The Art of James Gurney, is at the University of the Arts, but it's closing Monday.

9 a.m. to 4 p.m. Friday, Nov. 13 and Monday, Nov. 16 at the University of Arts von Hess Illustration Gallery, Anderson Hall 717 (333 S. Broad St.).

Up in the air

The marvelous Give & Take Jugglers have been purveying their mix of vaudeville, circus, theater, and music for more than 40 years, as they will in Sellersville on Saturday. Long may they toss!

1 p.m. Saturday, Nov. 14 at Sellersville Theater (24 W. Temple Ave., Sellersville).

Build a fort

So Sunday is International Fort Day — as in those constructions of sheets and pillows in the playroom, or sheet metal and cinder blocks in the backyard, or those nailed to a tree branch. (In honor of the day, we've made a fort out of our cubicle, and put up a sign that says No Editors Allowed — well, except for Molly Eichel, and Becky Klock, and John Timpane, and … OK, everybody's allowed. But it's still a cool fort!)

The wonderful Smith Playground presents a Fort Day activity, with all ages invited to build forts out of natural and found objects around the East Fairmount Park gem.

11 a.m. to 2 p.m. Sunday, Nov. 15 at Smith Memorial Playground and Playhouse (33rd Street and Reservoir Drive).