Yes! You will be able to synchronize events with your calendar if you have the Spond app. The app can be synchronized with both iCal (iOS) and Google Calendar (Android). You can also set reminders for events that you are attending.
If you declined this option the first time you downloaded Spond, your preferences can be changed your profile in the app (the profile icon in the top left corner)
If you can't find the calendar you wish to synchronise with in Spond's calendar settings, you need to add the calendar into the devices accounts:
iOS: Phone settings > Passwords and Accounts > Add account > Enable 'calendar'
Android: Phone settings > Account > Add account > Enable 'calendar'