White and Messi will arrange their schedules so that...
...they will eat 'Trucha a la parrilla' in March, and attend the bullfighting in May.
Because this puzzle is all about:
astrological star signs. Specifically, the symbols behind the star signs and the month in which they mainly fall (since star signs cross two months, but not equally - in each case here, we need the second month in which they fall).
First note that:
Walter White from Breaking Bad is diagnosed with stage III lung cancer. This connection with Cancer (22 June - 22 July) explains why he is 'free' in July.
Lionel Messi is also known as 'Leo' - the star sign for 23 July to 22 August, explaining why he is 'free' in August.
As for the four events:
each of these has a connection to a star sign symbol, and takes place in the second month connected with that star sign.
Rene Higuita was a goalkeeper renowned for performing 'the Scorpion Kick'. This link with scorpions leads us to Scorpio (23 October - 22 November), hence the November meeting.
The documentary Tembo involves an archer hunting with a bow and arrow. This connects with the archer sign, Sagittarius (23 November - 21 December), hence the December meeting.
So we can work out the other two:
'Trucha a la parrilla' is a fish dish, leading us to Pisces (19 February - 20 March), hence March.
Bullfighting leads us to Taurus (20 April - 20 May), hence May.