We went to Calella in the January and places were open, not everwhere mind you. We were AI though so it didn't really affect us pubwise. I would imagine with Lloret being a busier resort some places will be open but maybe a good idea to look at AI just incase

most of the bars/clubs will be shut, especially during the week.
the picadilly on lloret seafront is normally open, as is the robin hood/roxys in fenals. i was told by the boss that the robin hood may close before christmas, (but be open for chrismas/new year)depending on trade levels -as it has been quieter than usual this year because of the value of the pound.
there will be plenty of shops open.
for weather have a look here