Most courses are required to have synchronized lab topics scheduled from week to week. Many of the labs share the same lab rooms. If your lecture section shares lab rooms, you will need to confer with the other professors to work out a mutually agreeable weekly lab schedule before any changes are made.
If you wish to change the sequence of labs, please email lab@physics.umn.edu as soon as possible. Most changes can be worked out, however, equipment limitations might make changes impossible.