Double EXP: Yes, there is a 100% experience booster during the event.

The Explorer's Celebration starts on November 12 at 10AM EST, and runs until Monday, November 16 at 10AM EST, the limited-time Explorer’s Celebration grants you additional rewards for the following in-game activities:

• Double drops from harvest nodes (Fishing excluded)
• Double XP gains from every source (100% experience boost)
  • This stacks with other XP boosts such as scrolls or group multipliers
• Double gold earned from monster kills, quest rewards, and similar sources

These bonuses are available to all players in any zone in Tamriel.

You can find a list of all zones here. It might be a good idea to combine the event with a set you would like to obtain in a certain zone.

Note that the Explorer’s Celebration doesn’t grant Event Tickets and doesn’t have its own unique quests, Achievements, or collectibles associated with it. Additionally, the Impresario isn’t available during this limited period.

To summarize everything, the Explorer’s Celebration begins on thursday and runs for a full week only, so don’t miss out on your chance to get extra experience, gold, and resource node drops - Good Luck!