The conference league is the only hope for villareal and bilbao to play in european competition, but I think in this case villarreal have a better chance in my opinion to play in the conferencee league next season, facing barcelona which is no longer concerned with points of course villareal maybe can get a win in this match, while bilbao who face sevilla will of course get stronger pressure in the match, sevilla indeed have now secured a top 4 position but I think they will aim for the three points against bilbao later because they want to ensure a place to be in over atletico.
Villareal will not easily beat Barcelona even though they are no longer concerned with points to qualify for the Champions League next season. Barcelona are already safe to qualify for the Champions League, but they also don't want to end the season with a loss to Villareal.
Barcelona vs Villareal and Sevilla vs Bilbao matches in my opinion will be very interesting because one of the away teams will ensure themselves to qualify for the European Conference League next season. Sevilla shouldn't be losing at home, and neither should Barcelona.
Barcelona is no longer affected by any results obtained in the match later, but of course Barcelona also don't want to be embarrassed by achieving consecutive negative results after the draw with Cadiz last week, so it's likely that Barcelona will still try to get a win even though they probably not to fielding the main players, while villareal which has a mission to win seems to still have to work hard in that match if you don't want to lose the opportunity to play in the conference league next season, I agree with @falconer saying, even though barcelona no longer needs points to secure its position, but as a big team of course Barcelona will try to maintain their dignity at Camp Nou.