Five Things You Need to Know Today: July 30

1. Minute to Win it Olympics. The will host a special Olympic event tonight for teens. The Minute to Win it Olympics is a contest where teens face challenges with everyday objects. The free event is open to teens in grades 6-12 and starts at 7 p.m.

2. Group bike rides. Bike Newton hosts a  Monday evenings at 6 p.m. that starts from the  and visits a number of scenic points around the city. The ride, which will be between 7-10 miles, is open to cyclists of all ages. Today's ride will feature a tour of Cordingly Dam. Children must be accompanied by an adult. Anyone with questions can email nathan.aronow@verizon.net.

3. Fourth District Republican debate. The candidates vying for the Fourth Congressional District Republican nomination will debate tonight on NECN's Broadside with Jim Braude. The 30-minute debate will feature candidates Sean Bielat, Elizabeth Childs and David Steinhof. Tune in at 6 p.m. to catch the debate. 

4. Urban Tree Commission. The Commission will meet tonight at 5 p.m. in room 203 at . Tonight's agenda includes discussion of review of the tree manual, Forestry Department budget issues as well as the status of NSTAR gas leaks. 

5. Transportation changes. Do you know about ? The changes, which have been in effect for about a month now, include expanded service to City Hall and the library.