So if ever the event was done daily it'd go something like:
- Light - Play three matches with Light mechs with at least 100 match score. Reward: 150,000 c-bills and 5 MC.
- Medium - Play three matches with Medium mechs with at least 100 match score. Reward: 150,000 c-bills.
- Heavy - Play one matche with Heavy mechs with at least 100 match score. Reward: 50,000 c-bills.
- Assault - Play one matche with Assault mechs with at least 100 match score. Reward: 50,000 c-bills.
The amount could be more or could be less depending on the duration/frequency of the event. In this case, Lights are assumed to be the least played and then Mediums. They have better rewards with Lights having the MC reward. If done daily it only amounts to 150 MC each month, but it's a steady trickle that players can log back in to do.
If ever assault mechs become the least played then the high c-bill and MC reward would shift to that for the event cycle until the next batch of data comes in. This could change weekly or monthly or just from the previous day.
PGI can, once in awhile, throw in a dekkel or other item with the top weight class reward just to change things up a bit.
The rewards are nice enough that new players and those that want something extra can go for while not big enough that established players who don't want to be bothered will feel compelled to do the event.
Obviously the point of this event is to get more people to play the least popular weight classes with some incentives.