Economy advice: make sure you are set up to make recruits - bread production (bread people from prov house), brew production and bronze sword production should be your priority. Try to upgrade pop space a little too heading into event. Keep your barracks running on recruits.
Figure out which co-op (Tomb Raiders or Siege) you can run the most quickly with just recruit losses given your other available troops and gens.
Get your flower farms going for event resources. Talk to a friend or guildmate about a couple either better buffs or longer buffs (like fish steaks so the farms stay buffed for days).
Keep your farms going by running Tomb Raiders or Siege as often as your economy allows for refillers.
Keep your explores out on treasure searches. As soon as you have enough event resources, get the next explorer and send them out on treasure searches. The flowers they bring back effectively lower their cost, so the earlier you get them the better.
Save your valentine card buffs to use three at a time, swap them with a friend to get 3 hours of +200% xp, refillers, resources from adventure loot. So make sure you have the recruits available to run multiple tomb raiders or siege coops when you swap cards. These bursts of activity when you have real life time can probably provide more refillers and loot than trying to play the whole event without the 3x periods.
Open all the event doors. If you don't have time to play one day, still log in and open the door
Complete the quest chains.
Ignore decorations, etc. Focus on the explorers early in the event and unique buildings later in the event. If you think you can get enough flowers to buy the 16999 flower package with Anslem, that's a good way to obtain a solid general with in game currency (instead of gems).