Model Design, Nesting by Year

I'm in the process of designing an internal system and I'm having trouble designing the model so that it will function as I need it.

The basic idea is that everything is "Season" based, where a season is a year (2014, 2015, etc)

From the there we have Events and the the Seasons they are functioning in, (Event 1 (2014, 2015, etc) , Event 2 (2014, 2015, etc))

Then there are people who may be active any given year for a specific Event:

Bob Smith, 2014, Event 1 & Event 2

                  2015, Event 2

                  2016, Event 1

I have created a Season & Event Models:

class EventSeason(models.Model):

    season = models.IntegerField(max_length=4, primary_key=True)

class Event(models.Model):

    attraction = models.CharField(max_length=30, null=True, blank=False)

    seasons = models.ManyToManyField(EventSeason)

I have created the base person model and all the other fields for them (Address, etc) but I'm not sire how I to tie them to the seasons and events so that each season and event pair is maintained going forward. So for example I could historically lookup people from Event 1, 2014, for example. 

Hope this makes sense, thank you for any help,

Chris

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