If you are hoping for both experiences, secure the confirmed daytime plan first, then check the available night event. Build in travel time, a meal and a chance to get ready. The beach and pool venues have different rules from late-night clubs, so one outfit or reservation may not cover the whole day.
Budget for both activities separately. A daybed's minimum spend is not automatically credit towards a nightclub table, and a reservation in one establishment does not give you access to another. If the group is large, agree whether everyone is joining both sessions before paying deposits.
For groups, decide whether you want to spend the day together in a reserved area or simply attend the music event. Those can be different purchases with different admission rules. If you also plan to go out that night, factor in time to return to your accommodation, shower and change clothes; pool-club attire may not meet the nightclub's door policy. A useful enquiry includes your date, group size, ages, preferred music, total budget and whether you need tickets or a reserved space. Asking those questions before payment is far more reliable than working from a photograph of last summer's drinks menu.