We present our project to explore the stellar content of the nearest Milky Way massive star forming región, Cygnus-X. The main aim (but not the only one) is to understand the formation and evolution of single and multiple massive stars. Using the new WEAVE multifiber spectrograph attached to the 4.2-m WHT and within the SCIP survey we will secure high resolution, high S/N, multiepoch spectra of massive stars born in the same region of the Milky Way. Combined with Gaia data, the analysis of the spectra will enlighten the different evolutionary scenarios, their past and future, and their relative weights. The results of our project will constitute a cornerstone to interpret the observations in other regions of the Milky Way and nearby galaxies.