Sri Lanka will play their first-ever pink ball Test from October 6-10 in Dubai, Pakistan Cricket Board announced yesterday.
The series will comprise two Tests, including the second a day-night, and five one-day and three Twenty20 internationals. 

The final T20 is expected to be played in Lahore in Pakistan, depending on the success ofteh World XI tour. No international team has returned to Pakistan since 2009 terrorist attack on Sri Lanka cricketers injuring six players. However Sri Lanka Cricket has agreed to send their national team to Pakistan if the security of the players are guaranteed
The Test series will begin in Abu Dhabi on September 28, which will be followed by a day-night encounter in Dubai on October 6. 
Meanwhile, the ODI series will be played in the UAE from October 13-23, in Dubai, Sharjah and Abu Dhabi. 
The first two Twenty20 internationals will take place in Abu Dhabi on October 26 and 27 while the finale will be in Lahore on October 29. 

Here is the complete Schedule: 

September 28-October 2 1^st Test Abu Dhabi 

October 6-10 2^nd Test (day-night) Dubai 

October 13 1^st ODI Dubai 

October 16 2^nd ODI Abu Dhabi 

October 18 3^rd ODI Abu Dhabi 

October 20 4^th ODI Sharjah 

October 23 5^th ODI Sharjah 

October 26 1^st Twenty20 international Abu Dhabi 

October 27 2^nd Twenty20 international Abu Dhabi 

October 29 3^rd Twenty20 international Lahore